1. Snakes
By Mr. “No legs” Chapman

2. Order: Serpentes
 Snakes Characteristics:
 1. No eyelids, but have contact like
covers called brilles.
 2. No ears, but can feel vibrations
through entire body.
 3. Fangs that deliver venom.
 4. All are carnivores

3. Snakes
 Snakes can be found every except
Antarctica, Iceland, and New
Zealand.
 Most snakes are terrestrial, but can
be tree dwellers, burrows, or live in
the sand.

4. Eye Pupils
 Snakes pupils can tell you when they
are active.
 1. A vertical pupil
are found in
nocturnal snakes.

5. Eye Pupils
 2. A round pupil is
found in snakes
that are active
during the day
(Diurnal).

6. Hunting
 Snakes kill their prey by 2 methods.
 1. Constriction – snake wraps its
body around the prey and prevents it
from breathing.
 2. Venom: 2 main types
– Hemotoxins
– Neurotoxins

7. Hunting
 The venom does 2 things for the
snake:
 1. Kills the prey, so the snake does
not have to chase it.
 2. It begins to break down the tissue
of the prey.

8. Hunting
 Snakes use their
tongue to follow
chemical scents
using the
Jacobson’s Organ.
 Some snakes also
have heat-sensitive
pits that detect the
direction of the
prey.

9. Locomotion
 4 ways snakes
move:
 1. Serpentine
Movement: body
moves along in a
series of curves
and pushes off
objects on the
ground.

10. Locomotion
 2. Concertina
Movement: body
coils and then grips
the ground pulling
the rest of the
body forward.

11. Locomotion
 3. Sidewinder:
snake touches the
ground at only 2
points.

12. Locomotion
 4. Caterpillar Crawl:
crawl straight
forward by belly
scales sliding
forward catching
the ground and
pulling the rest of
the body forward.

13. Facts
 The 2 most venomous snakes are
found in Australia.
 1. Desert Taipan
 2. Dubois’ reef snake
 0.7 ounces of their venom is fatal.