is any species belonging to the family Crocodylidae
(sometimes classified instead as the subfamily Crocodylinae
). The term
can also be used more loosely to include all members of the order Crocodilia:
i.e. the true crocodiles, the alligators and caimans (family Alligatoridae) and
the gharials (family Gavialidae), or even the Crocodylomorpha which includes
prehistoric crocodile relatives and ancestors.
Crocodiles are large aquatic
reptiles that live throughout the Tropics in Africa, Asia, the Americas and
Australia. Crocodiles tend to congregate in freshwater habitats like rivers,
lakes, wetlands and sometimes in brackish water. Some species, notably the
Saltwater Crocodile of Australia, Southeast Asia and the Pacific islands often
live along the coastal areas. It is also known to venture far out to sea. They
mostly feed on vertebrates like fish, reptiles, and mammals, sometimes with
invertebrates like mollusks and crustaceans, depending on species. They are an
ancient lineage, and are believed to have changed little since the time of the
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Crocodiles are the most advanced of all reptiles despite their prehistoric
look. Unlike other reptiles they have a four-chambered heart, diaphragm and
cerebral cortex. Their external morphology on the other hand is a sign of their
aquatic and predatory lifestyle. A crocodile’s physical traits allow it to be a
successful predator. They have a streamlined body that enables them to swim
faster. They also tuck their feet to their sides while swimming, which makes the
animal even faster, by decreasing the water resistance. They have webbed feet
which, although not used to propel the animal through the water, allow it to
make fast turns and sudden moves in the water or initiate swimming. Webbed feet
are an advantage in shallower water where the animals sometimes move around by
Crocodiles are very fast over short distances, even out of water. They have
extremely powerful jaws capable of biting down with 3,000 pounds of pressure per
square inch, and sharp teeth for tearing flesh, but cannot open their mouth if
it is held closed. There are stories of people escaping from the long-snouted
Nile Crocodile by holding its jaws shut. Zoologists will often subdue crocodiles
for study or transport by taping their jaws or holding their jaws shut with
large rubber bands cut from automobile inner tubes. All large crocodiles also
have sharp and powerful claws. They have limited lateral movement in their neck,
so on land protection can be found by getting even a small tree between the
crocodile's jaws and oneself.
There is no reliable way of measuring crocodile age, although several
techniques could be used to derive a reasonable guess. The most common method is
to measure lamellar growth rings in bones and teeth - each ring corresponds to a
change in growth rate which typically occurs once a year between dry and wet
seasons. Bearing these inaccuracies
in mind, the oldest crocodilians appear to be the largest species. C. porosus is
estimated to live around 70 years on average, and there is limited evidence that
some individuals may exceed 100 years. One of the oldest crocodiles recorded
died in a zoo in Russia apparently aged 115 years old.
A male freshwater crocodile at the Australia Zoo is estimated to be 130 years
old. He was rescued from the wild by Bob and Steve Irwin after being shot twice
by hunters. As a result of the shootings, this crocodile (known affectionately
as "Mr. Freshy") has lost his right eye.
Morelet's Crocodile, also known as the
Mexican Crocodile, is a relatively small crocodilian found only in
fresh waters of Mexico, Belize and Guatemala. It usually grows
10 feet (3.0 m) in length. It is an endangered species.
species of crocodile can be largely found in freshwater swamps and
marshes which are located inland, and in large rivers and lakes.
Both of these habitats are forested to help add cover.
Size greatly varies between species, from the dwarf crocodile to the enormous
saltwater crocodile. Large species can reach over 5 or 6 meters long and weigh
well over 1200 kg. Despite their large adult size, crocodiles start their life
at around 20 cm long. The largest species of crocodile, also Earth's largest
reptile, is the Saltwater Crocodile, found in northern Australia and throughout
South-east Asia. According to some scientists, there are no truly reliable records of any
non-prehistoric crocodiles over 8.64 m.
In the town of Normanton, Queensland, Australia, there is an 8.63 meter
fibreglass mould of a crocodile called "Krys the Croc.," shot in 1958 by
Krystina Pawloski, who found the animal on a sandbank on the Norman River.
There is a report of a saltwater crocodile in Australia that was 8.2 m long.
There is also a skull of a salt water crocodile from Orissa, India that is very
large and the animal is estimated to have been 6.4 to 7 m long.
The other two larger certifiable records of complete crocodile are both of
6.2 m crocodiles. The first crocodile was shot in the Mary River in the Northern
Territory of Australia in 1974 by poachers and measured by wildlife rangers. The
second crocodile was killed in 1983 in the Fly River, Papua New Guinea. In this
latter crocodile it was actually the skin that was measured by zoologist Jerome
Montague, and as skins are known to underestimate the size of the actual animal,
it is possible this crocodile was at least another 10 cm longer.
The largest crocodile ever held in captivity is an Estuarine/Siamese hybrid
named Yai (Thai: ใหญ่, meaning big) (born 10 June, 1972) at the famous
Samutprakarn Crocodile Farm and Zoo, Thailand. This animal measured 6 m in
length and weighs 1,114.27 kg.
Another huge captive crocodile was a saltie named Gomek. Gomek was captured
by George Craig in Papua New Guinea and sold to St. Augustine Alligator Farm in
Florida. Gomek died of heart disease in February 1997. By this stage, he was a
very old crocodile. When he died, he was 5.5 m long - as confirmed by St.
Augustine Alligator Farm - and probably between 70 and 80 years old.
On June 16, 2006, a 7.1 m giant saltwater crocodile in Orissa, India was
crowned the world's largest living crocodile. It lives in Bhitarkanika Wildlife
Sanctuary and in June 2006, was entered in the Guinness Book of World Records.
Wildlife experts, however, argue that the largest crocodile so far found in
the Bhitarkanika was almost 7.62 m which could be traced from the skull
preserved by the Kanika Royal Family. The crocodile, probably was shot dead near
Dhamara during 1926 and later its skull was preserved by the then Kanika King.
The crocodile experts said the crocodile would be about 7.62 m since the size of
the skull was measured one seventh of the total length of the body.
|Crocodiles, like dinosaurs, have the abdominal ribs modified into
Biology and behaviour
Crocodiles are ambush hunters, waiting for fish or land animals to come
close, then rushing out to attack. As cold-blooded predators, they can survive
long periods without food, and rarely need to actively go hunting. The
crocodile's bite strength is up to 3,000 pounds per square inch, comparing to
just 100 psi for a labrador retriever, 350 psi for a large shark, or 800 psi for
a hyena. Despite their slow
appearance, crocodiles are top predators in their environment, and various
species have been observed attacking and killing sharks.
A famous exception is the Egyptian Plover which is said to enjoy a symbiotic
relationship with the crocodile. According to unauthenticated reports, the
plover feeds on parasites that infest the crocodile's mouth and the reptile will
open its jaws and allow the bird to enter to clean out the mouth.
Crocodiles eat fish, birds, mammals and occasionally smaller crocodiles. Wild
crocodiles are protected in many parts of the world, but they also are farmed
commercially. Their hide is tanned and used to make leather goods such as shoes
and handbags, whilst crocodile meat is also considered a delicacy in many parts
of the world. The most commonly farmed species are the Saltwater and Nile
crocodiles, while a hybrid of the Saltwater and the rare Siamese Crocodile is
also bred in Asian farms. Farming has resulted in an increase in the Saltwater
Crocodile population in Australia, as eggs are usually harvested from the wild,
so landowners have an incentive to conserve crocodile habitat. Crocodiles are
more closely related to birds and dinosaurs than to most animals classified as
reptiles, the three being included in the group Archosauria ('ruling reptiles').
See Crocodilia for more information.
Danger to humans
The larger species of crocodiles can be very dangerous to humans. The
Saltwater and Nile Crocodiles are the most dangerous, killing hundreds of people
each year in parts of South-East Asia and Africa. Mugger crocodiles and possibly
the endangered Black Caiman, are also very dangerous to humans. American
alligators are less aggressive and rarely assault humans without provocation.
The most deaths in a single crocodile attack incident may have occurred during
the Battle of Ramree Island, on February 19, 1945, in what is now Myanmar. Nine
hundred soldiers of an Imperial Japanese Army unit, in an attempt to retreat
from the Royal Navy and rejoin a larger battalion of the Japanese infantry,
crossed through ten miles of mangrove swamps which contained Saltwater
Crocodiles. Twenty Japanese soldiers were captured alive by the British, and
almost five hundred are known to have escaped Ramree. Many of the remainder may
have been eaten by the crocodiles, although gunfire from the British troops was
undoubtedly a contributory factor. Crocodiles are the leading cause of animal
related deaths as of 2001.
West African dwarf crocodile
from the forests of West and West Central Africa
Crocodile leather can be made into a variety of goods, such as wallets,
briefcases, purses, belts and hats.
Crocodile as food
Crocodile is consumed in some countries such as Australia, Ethiopia,
Thailand, South Africa and also Cuba (in pickled form). It can also be found in
specialty restaurants in some parts of the United States. The meat is white and
its nutritional composition compares favourably with that of more traditional
meats. It does tend to have a slightly higher cholesterol level than other
meats. Crocodile meat has a delicate flavour and its taste can be complemented
by the use of marinades. Choice cuts of meat include backstrap and tail fillet.
Differentiation from alligators
While often confused with each other, alligators and crocodiles belong to two
quite separate taxonomic families, and are as distinct from one another as
humans are from gorillas. As for appearance, one generally reliable rule is that
alligators have U-shaped heads, while crocodiles are V-shaped - which can be
remembered by noting that "A" in alligator comes before "C" in crocodile, and
"U" comes before "V".
- The crocodile gets its name from the Greeks who observed them in the Nile
river. The Greeks called them krokodilos, a compound word from kroke, which
means "pebbles" and drilos, which means "worm". To the Greeks, this "worm of the
stones" was so named because of the crocodiles habit of basking in the sun on
gravel-covered river banks.
- Petsuchos was the name given by the Greeks to the live crocodile at
Crocodilopolis in Ancient Egypt, which was worshipped as a manifestation of the
Egyptian god Sobek; the deification of crocodiles.
- Crocodile embryos do not have sex chromosomes, and unlike humans sex is not
determined genetically. Sex is determined by temperature, with males produced at
around 31.6 degrees celsius, and females produced at slightly lower and higher
temperatures. The average incubation period is around 80 days, and also is
dependent upon temperature.
- Some of the extinct relatives of true crocodiles, members of the larger
group Crocodylomorpha, were herbivorous.
- During a voyage in 1585-1586, Sir Francis Drake named the Cayman Islands
after the islands' 10-foot crocodiles, called "Caymanas" by the native Caribs.
- Five live baby crocodiles are seen in 1967 television series Thunderbirds,
of the episode Attack of the Alligators.
Taxonomy of the Crocodylidae
Most species are grouped into the genus Crocodylus. The two other
living genera of this family are both monotypic: Osteolaemus and
- Family Crocodylidae
- Subfamily Mekosuchinae (extinct)
- Subfamily Crocodylinae
- Genus Euthecodon (extinct)
- Genus Osteolaemus
- Dwarf Crocodile, Osteolaemus tetraspis (there has been controversy
whether or not this is actually two species; current thinking is that there is
one species with 2 subspecies: O. tetraspis tetraspis & O. t. osborni)
- Genus Crocodylus
- Crocodylus acutus , American Crocodile
- Crocodylus cataphractus , Slender-snouted Crocodile (Recent DNA
studies suggest that this species may actually be more basal than Crocodylus,
and belong in its own genus, Mecistops)
- Crocodylus intermedius , Orinoco Crocodile
- Crocodylus johnstoni, Freshwater Crocodile
- Crocodylus mindorensis, Philippine Crocodile
- Crocodylus moreletii , Morelet's Crocodile or Mexican Crocodile
- Crocodylus niloticus, Nile Crocodile or African Crocodile (the
subspecies found in Madagascar is sometimes called the Black Crocodile)
- Crocodylus novaeguineae, New Guinea Crocodile
- Crocodylus palustris, Mugger Crocodile, Marsh Crocodile, or Indian
- Crocodylus porosus , Saltwater Crocodile or Estuarine Crocodile
- Crocodylus rhombifer , Cuban Crocodile
- Crocodylus siamensis, Siamese Crocodile
- Subfamily Tomistominae (recent studies may show that this group is
actually more closely related to the Gavialidae)
- Genus Kentisuchus (extinct)
- Genus Gavialosuchus (extinct)
- Genus Paratomistoma (extinct)
- Genus Thecachampsa (extinct)
- Genus Kentisuchus (extinct)
- Genus Rhamphosuchus (extinct)
- Genus Tomistoma
- Tomistoma schlegelii, False gharial or Malayan gharial
- Tomistoma lusitanica (extinct)
- Tomistoma cairense (extinct)
- Tomistoma machikanense (extinct, pleistocene species from Japan)
- Sarcosuchus (extinct, also known as Super Croc).
- Crocodylus Rhombifer
In popular culture
- In the fictional Peter Pan series by J.M Barrie, a large crocodile had
bitten off Captain Hook's hand, leaving him with his hook. It pursued him ever
after. As it had also eaten a clock, its ticking let Hook know whenever the
crocodile was approaching. It eventually caught up with and consumed him. In
Steven Spielberg's sequel film, Hook, it was shown that despite this, the
Captain had gained the upper hand – the crocodile, dead and stuffed, had been
transformed into a town-square clock tower – which eventually fell forwards onto
him, 'eating' the villain once again.
- There are many horror films featuring rampaging giant crocodiles in the
manner of the shark in Spielberg's Jaws. While some follow the urban
legend of unwanted pets being flushed down the toilet and growing to huge and
deadly size in the sewers, one recent entry, Lake Placid, instead has an
isolated variety of giant croc discovered in the wild.
- In the Crocodile Hunter series, starring Steve Irwin, crocodiles are
seen in most episodes. Steve Irwin himself personally admired crocodiles, and
one of the activities he was known for is feeding crocodiles at his Australia
- The Stephan Pastis comic strip Pearls Before Swine features The
Fraternity of Crocodiles as the usually unsuccessful antagonists of their
neighbor, Zebra, and who mostly speak in grade school-like phonetics.
- In the Disney movie The Wild, two abandoned pet crocodiles that dwell
in the sewer guide the protagonists to the harbour rather than eating them.
- In the Disney movie The Rescuers, villain Madame Medusa has a pair of
crocodiles as henchmen; they menace her kidnap victims at her command.
- In the Disney movie The Emperor's New Groove and spin-off TV shows
and sequels, the villain, Yzma, has a pet crocodile that lives in a chamber
accessed by a lever next to another lever that accesses her secret lab. Often,
she comically pulls the wrong lever, falling into the pit only to return with
the croc latched onto her, proclaiming, "Why do we even have that lever?!"
- The Cheburashka series of books (by Eduard Uspensky) and animated
films feature Crocodile Gena as one of the main characters. He works in a zoo,
as a crocodile (naturally).
- In the anime series Yu-Gi-Oh! GX, a transfer student from Australia
named Jim Crocodile Cook has a pet crocodile named Karen. He also has a special
backpack for her that he carries her around in.
- In the anime series One Piece, there is a fictional species of
crocodile called the Bananawani, named for the banana-shaped growth on its head.
- In the Batman universe, one member of the Dark Knight's rogues gallery is
Killer Croc (Waylon Jones), a fighter of immense strength but variable
intelligence who, due to his suffering a skin deformity and having filed his
teeth to points, resembles a humanoid crocodile.
- In the 1990s animated Batman series, one episode features the Sewer King,
who rules over a community of orphaned children beneath Gotham City and controls
the crocodiles that live there, setting them on the Batman.
- In the James Bond film Live and Let Die, Dr Kananga alias Mr Big
maintains a crocodile farm in the Louisiana Bayou with the legend, 'Trespassers
Will Be Eaten' on its gate. It is actually a front for the processing stage of
his heroin racket. Bond is taken here to be killed by henchman Tee Hee Johnson,
who explains that one of the farm's crocs, 'Old Albert', is responsible for his
using a prosthetic arm. Abandoned on an island in the midst of the lake full of
hungry crocs, Bond escapes by running across the reptiles' backs. A croc
features feature prominently on the film's poster.
- In the James Bond film Octopussy, 007 crosses a croc-infested lake in
India in a mini-sub disguised as a crocodile, to confront the eponymous shady
character on her private island. Later after a fight, he and an assailant fall
into the water and he is believed by Octopussy to be killed by a large croc that
then attacks (he actually escapes in his sub).
- In Pokemon, the starter for the second generation of pokemon, Totodile, is a
crocodile-like creature that alludes to this.
- In the Animorphs series by K.A. Applegate, The Reaction (Animorphs) (#12)
focuses on Rachel (Animorphs) acquiring a crocodile morph and becoming allergic
|Slender-snouted Crocodile, Crocodylus cataphractus
|The dwarf crocodile (Osteolaemus
tetraspis) is an African species of crocodile. It is also the
smallest crocodile species in the world. Dwarf crocodiles attain a
medium adult length of 1.5 meters (5 feet)
Can everybody just please stop killing wild animals? If you
breed them you can kill them because you are not taking something out of an eco