Birds
Reproduction
They are oviparous
Respiration
They breathe through lungs
Their lungs are more complex than the reptiles but less than the mammals lungs
perts of the body
They have four limbs
They are covered by feathers
They have a beak
nutriction
They can be carnivorous or herbivorous
Their foot depens of the form of their beak
Subgrups
Can fly
Can't fly