First animals to produce amniotic eggs where
the embryo develops in a fluid filled sac called an amnion. This prevents the
embryo from drying out, and allowed the reptiles to live only on land. Reptiles
have scaly skin made of the protein keratin. Since reptiles do not need to
breathe through the skin, it is much thicker than the skin of amphibians.
Reptiles periodically shed their skin and have a well-developed respiratory
system with branched bronchial tubes in their lungs. Reptiles have teeth adapted
for holding prey rather than chewing it because most species in this class
swallow their prey whole. Reptiles have good hearing and vision and a tongue is
used for smell as well as taste. Reptiles are cold blooded, meaning
they warm up by absorbing heat rather than generating their own heat, like birds
and mammals
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