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Reptiles and Birds

Across
Term used to describe animals whose eggs hatch outside of the mother's body
Part of the egg that cushions and protects the embryo
Type of feather used for insulation
Reptiles and birds both have a backbone so they are...
Most reptiles do NOT care for their young. However, _____ make excellent mothers
Reptiles and birds reproduce by _____ fertilization
Ventral part of a turtle's shell
The part of a bird's digestive system where food is stored and moistened
Animals such as reptiles that rely on the environment to control their body temperature
Down
In a bird's digestive system, it is the organ that helps in the mechanical breakdown of food
Type of feather used primarily for flying
In an egg, it is the part that serves as the main food supply to the developing embryo
Only birds have these structures; used for flight and to keep warm
An example of a reptile that has a four chambered heart
Part of the egg that stores waste
Part of the egg that functions in gas exchange
The most notable difference between reptile and bird eggs can be found in the...
Where air first enters when a bird inhales (two words)
Animals that are able to maintain a constant internal body temperature
Dorsal part of a turtle's shell
Unlike amphibians, reptiles have _____ skin