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exam 4 bio 305
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crocadilians
gavial
alligator
crocodile
crocodile vs. alligator
alligator → even teeth, rounder head
crocodile → top + bottom teeth show, v shaped head
lizards
geckos
small, agile
nocturnal forms
adhesive toe pads
iguanids
many new world lizards
chameleons
arboreal lizards of Africa
extendible tongue
skinks
smooth scales
monitors + relatives
get large
arid adapted
amphisbaenians
burrowing
usually legless
CT lizards
five lined skink
Italian wall lizard
venomous lizards
neurotoxins
pain, edema + weakness
store fat in tails
snakes
~3,400 spp (~600 venomous)
120 spp in USA (~21 venomous)
can eat prey several times their own size
two halves of lower jaw are loosely joined
non movable eyelids
most have poor vision
arboreal snakes are exception
lack external ears
mainly use chemical senses with forked tongue (Jacobson’s organ)
pit vipers → sense heat
~8,000 snake bites each year
nonvenomous snakes use constriction or biting + swallowing
CT snakes
eastern ratsnake
smooth green snake
eastern hognose
eastern worm snake
eastern garter
northern ringneck
eastern milk snake
northern water snake
northern black racer
northern copperhead
timber rattlesnake