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4 Cards in this Set
- Front
- Back
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first fossils found when..
postulate on origin of snakes |
-cretacerous
-early mesozoic from monitor lizards |
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SNAKE LOCOMOTION
1.lateral undulation 2.rectilinear 3.concertina 4.side-winding 5.Aerial gliding |
1. in water, wave motion down the body, pushing against water. terrestrial- waves passing down the body, pushing against irregularities
2.ventral scales are moved down and backwards 3. snake braces it body against wall and pushes/poulls 4. on sand, snake throws the head in the direction of motion followed by the tail 5. expand ventral scales to create ventral concavity and increased surface area. |
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rattle snake
garter snake rubber boa sharp-tailed snake night snake |
-only venomous in BC, live bearer
-live bearer -live bearer -oviparous -dryhabitats |
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ground squirrel defenses to rattlesnakes
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1. mask their scent with rattlesnake skins
2. use infrared signal to deter rattlesnakes |
