1. ZZOOOOLLOOGGYY
CCRROOCCOODDYYLLUUSS
(magar)
Diksha Sharma
Sec.- B
Batch- 4
Roll no.- 620

2. CCLLAASSSSIIFFIICCAATTIIOONN
PHYLUM CHORDATA
SUBPHYLUM VERTEBRATA
SUPERCLASS GNATHOSTOMATA
CLASS REPTILIA
SUBCLASS ARCHOSAURIE (possesses
both temporal arches)
ORDER CROCODILIA (exoskeleton of
bony plates,scales & tail long,
laterally compressed)

3. HABIT & HABITAT
 The world's largest living
reptiles relish privacy and
warm weather, and thrive in
still or slow waters that
provide plenty of
camouflage.
 Crocodiles inhabit every
continent except Antarctica
and Europe.
 Cold-blooded, they flourish
in tropical habitats where
they can bask in the sun

4. MMOORRPPHHOOLLOOGGYY
 Body is covered with an exoskeleton of horny thick
epidermal scales provided with dermal bony plates.
 The general colour of the upper part is dark olive- brown.
 The head is triangular and rough at the top.
 The snout (long nose) is stout.
 Limbs are pentadactyle with 5 fingers & 4 toes.
 The fingers are webbed at the base and the outer toes
are broadly webbed.
 The tail is long & laterally compressed.
 There are upper & lower jaws, each contains 19 teeth on
either side.

6.  Vertebrae are procoelous (concave at the anterior
end of the centrum and usually convex at the
posterior end of the centrum).
 The ears are covered by movable flaps of skin.
 The 5th tooth in the upper jaw is the largest & the 4th
tooth in the lower jaw fits into a notch in the upper
jaw.
 Tongue not protrusible. There are salt glands found
on the tongue.
 Body 4-6 meters in length and coverd by leathery
armour of osteoscutes arranged in transvers rows.
 They have four chamberd heart.
 they don’t have any sweat glands. To release heat,

7.  They are able to hold their breath for a couple of hours
without any damage to the body or brain.
 They can also slow down their metabolism when food is
scarce. As a result a large sized crocodile may only need to
eat few times per month to survive.
 they have what appears to be tears streaming down their
eyes.They aren’t really tears though but a type of solution
the body creates to help them cleanse around the eyes.
 They have a valve that will pinch the nostrils closed
so that water doesn’t enter them.

8.  They continue to grow new
teeth when others fall out.
This is part of how they are
able to live to be 70 to100
years of age.
 Crocodiles will intentionally
consume large rocks. This is
to help balance out the needs
of their digestive system. It
will help to crush the foods
that they have swallowed so it
can be used by the body for
nutrients.

9. REPRODUCTION
 For crocodiles the mating season usually will begin in July or
August.
 They are ready to mate when they are about 8-10 years of age.
 The males tend to put on a great show of power and dominance
with each other.
 The mating will take place under the water.
 The females will dig at least 10 feet into the ground. They want
to make a burrow where they can deposit their eggs and prevent
other predators from consuming them.
 It takes about 80 days from conception for the young to hatch.
 The young will spend several months in the close proximity of
their mother. While she will do all she can to offer protection and
direction her efforts are often in vain.
 If the temperature inside the nest is below 31.7°C (89.1°F), or
above 34.5°C (94.1°F), the offspring will be female. Males can

11. IIMMPPOORRTTAANNCCEE
 While in many cultures
they have been hunted
for food or to make items
out of leather.
 They are also destroyed
to get rid of these strange
looking reptiles.
 Crocodiles are known as
the species that cleans
up the river as they eat
carcasses of other
species and balance its
population in the habitat.
 They are key predators at

12. Threats to Crocodiles:-
a) Habitat loss
b) Hunting & Exploitation for hide
c) Hybridisation