REPTILES AND BIRDS CALDERONI MATTEO AND MAGNANI MARCO.
BIRDS Birds (class Aves) are feathered, winged, bipedal, endothermic ( warm-blooded), egg-laying, vertebrate animals. With around 10,000 living species, they are the most speciose class of tetrapod vertebrates.
The flightMost birds can fly, whichdistinguishes them from almostall other vertebrate classes.Flight is the primary means oflocomotion for most birdspecies and is used forbreeding, feeding, andpredator avoidance and escape.
Curiosity Chromosomes Birds have two sexes: male and female. The sex of birds is determined by the Z and W sex chromosomes, rather than by the X and Y chromosomes present in mammals. Male birds have two Z chromosomes (ZZ), and female birds have a W chromosome and a Z chromosome (WZ).
Reptiles Reptiles (Reptilia) are members of a class of air- breathing, ectothermic (cold- blooded) vertebrates which are characterized by skin covered in scales and/or scutes
Metabolism All reptiles exhibit some form of cold-bloodedness so that they have limited physiological means of keeping the body temperature constant and often rely on external sources of heat.
Orders The modern reptiles are divided in 3 big orders: lorica, such as crocodiles, turtles and scaled such as lizards. They are all ectotermic and tetrapods.