Absolutely nothing. If there is a benefit, then by definition, it is not altruism.
So the question would be why do animals do things that would be apparently "altruistic", such as take care of a member of another species, or take care of offspring that are not there own? Technically, I guess you could only answer this on a case by case basis, but one theory is that the animal is only following its instincts, and although that generally results in a biological benefit for the organism, there are always exceptions to the rule.
Some animals of higher cognition such as chimps might have a similar form of empathy as humans. They have mirror neurons as well, and are social animals. Biology would sort of dictate that they be altruistic with members of their group which usually are for the most part extended family.
Other animals such as bats, which don't have that level of intelligence, have evolved altruistic behaviours because it ultimately benefits an entire group. A 'you scracth my back now and I'll scratch yours when you need it' sort of strategy.
A cheetah might learn how to prey and capture an animal
An animal might change it's behavior and body structure
They might start sneezing they might have a wet tail if it is a small animal or a wet nose for animals like dogs. The animal might seem distressed
The animal might not like what she/he is eating so they might make a reaction or just might spit it out. If they like it they will be all nice and usually calm. It really depends on the animal that you are asking about.
because we adopt through evolution. also passing characteristics on their offspring is a key role for evolution.
that mankind is basically the same as any other beastly animal
Its own pregnancy? I would certainly hope so.Some other animal's pregnancy? Probably smells and behavioral clues would cause the cat's behavior to change. Its behavior might be interpreted as prescient.
It is when a close relative has a behavior issue then you might be likely to get that behavior issue. Like if your father has ADHD you might be likely to get ADHD. It depends on how you are related and how strong the behavior issue is.
it basicly means that in the future they might engage in hunting beavers more than they ever did
Lots of people may want to engage in "naughty" behavior, but may not because they fear the consequences might be dangerous. You've found a way to indulge your exhibitionism in a safe environment. As long as everyone is cool with it, enjoy.
They might have good behavior and listens. Or they are honest.
it might