Answer: Always; Always
Step-by-step explanation:
Animals are a wide in study. Within Animals we have Mammals, amphibians, birds, reptiles, fishes, insects, crustaceans, arachnids. Within just birds we have various variety of birds, an example is the chicken, also gave parrot, also within some of this birds, there is a also a variety. There is always a variety within the animal kingdom and variety of traits