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(All images came from google searches)
Okasha, S. (7/21/2013).  Stanford.edu. Retrieved from <https://plato.stanf ord.edu/entries/altruism-biological/>.

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Overall, altruistic behavior is selflessness among animals. One animal blatantly disregards their needs to help another. This type of behavior is key to the survival of animals that live in groups.

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Altruistic Behavior can help a population in a number of ways. One way is by actually saving the lives of others in the population by sacrificing one's self to a predator. One example of this is meerkats. When a meerkat spots a predator, that meerkat alerts the others that there is a predator, but draws attention to themselves. This puts that meerkat at risk because while they are making the predator known to the population, they are also making themselves known to that predator.
Another way that altruistic behavior helps a population is by one animal giving another something necessary to survive. An example of this is in vampire bats. If one bat in a group does not feed, other bats will give blood to that bat so it doesn't starve. The bats that donate blood though pay the cost of not being as fit as everyone else. Overall, this behavior helps the population as a whole survive.

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Characteristics for animals that have altruistic behavior is putting others before one's own need. This can be anything from feeding another animal to drawing attention to one's self so that others can escape a predator. This behavior usually comes at a cost to the animal that expresses it. The cost for most animals is a reduced survivability fitness or reproductive fitness. This type of behavior is often found in species with social structures.