ethological
the main factor for the increase of diversity is the environment. in many areas of the world the environment changes rapidly, and because of this animals have to adapt quickly, sometimes change in behaviour. so many animals evolve into something new that will benefit them more in that environment, take finches for example (theory of Charles Darwin), many finches evolved to have different beaks to suit the food they were provided with in the area (Galapagos Islands). in some cases animals permanently move from their normal habitat to a new one where the environment is more suitable for them. and that's why there is a diversity in animals.
No - that is not normal behaviour.
the main factor for the increase of diversity is the environment. in many areas of the world the environment changes rapidly, and because of this animals have to adapt quickly, sometimes change in behaviour. so many animals evolve into something new that will benefit them more in that environment, take finches for example (theory of Charles Darwin), many finches evolved to have different beaks to suit the food they were provided with in the area (Galapagos islands). in some cases animals permanently move from their normal habitat to a new one where the environment is more suitable for them. and that's why there is a diversity in animals.
The study of smaller animals would be Biology; the study of larger animals is called Zoology. Ethology, as an answer, has been provided. Ecology is also thoroughly relevant.
yes anything out of normal in an animals environment will cause physical or behavioral changes in them. A drought for instance will cause many animals to die and bring out competitive responses in the remaining ones for the available water, Migration in animals is triggered in many cases by a lack of resources.
An antifeedant is any substance which inhibits normal feeding behaviour.
this means that you or someone else is not aware.lacking in normal awareness of the environment, not aware of one's actions or behaviour
There are many but these are the main ones. -Ideal Diet for the species in question -Freedom from pain/abuse or disease -Correct environment -Proper Social housing. E.g. An animal that spends its life in solitude should be housed in solitude unless you plan to breed and have a licence to do so. -The ability to exhibit normal behaviour E.g. if your animal naturally climbs provide an environment for it to do so safely.
If the behaviour of a parent is that of a sociopath then yes it can sometimes be inherited. Children copy their parents, they rationalise the behaviour as normal and so they replicate it.
Because we're normal.
Yes - that's perfectly normal behaviour.