Nov 24 - Animals Lecture #20 - Reptiles

The enclosure was why they were so efficient to keep

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The enclosure was why they were so efficient to keep this form Hide in enclosure Protection it offers Was slowed down though o Respiration – lungs, mouth, cloaca Only animal that can breathe through their ass except sea cucumber o Smell and colour vision (most are deaf mute) Excellent sense of smell and colour because they were so slow so don’t they spend 30 mins getting there and wasting energy MYTH #1 : turtles are slow o Not all turtles are slow (aquatic ones are fast) o Fun fact: some turtles species live to be 255 year old Very slow metabolism Diapsida: Snakes o Snakes (Serpentes) o Lizards (Lacertilia o Snake-like lizards o Amphisbaenids Snakes (Serpentes) o Limbless and lengthy body plan can be limiting o Constrictors – ambush prey Do not actively hunt prey due to energy cost They are heavy and long so not agile Will sit and wait and attack and eat o Arboreal snakes- binocular vision Actively hunt – smaller preys o Others actively forage (vibration/smell/heat) o Special sensory structures used for hunting o Oviparous/ovoviviparous/viviparous Snakes lay eggs Oviparous Ovoviviparous Lay eggs inside body cavity and just leave them there
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Vivparous o Eating habits Snake venom: Neurotoxic – went get to brain – paralyzes stop control for breathing etc Hemorrhagin – reach blood vessels and break it / internal bleeding Most snake venom are mix of both Advantageous of venom: to eat something that’s not fighting back Some inject venom then swallow prey, others shallow live prey. Smell: jacobson’s organs (forked tongue) When they stick out tongue it samples air molecules When tongue comes back- it sends a signal to brain on details of smell Sight:pit organ (long wave infrared energy) They can see heat o Enables to see heat energy of a prey o Snake get 2 visual input ( A and B) o It can overlap o This enables to hunt daylight and darkness
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  • Fall '08
  • Membranes, RNA, Water conservation strategies, Better body support, exclusively terrestrial vertebrates, Snake-like lizards, snakes- binocular vision

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