system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How does a male animal know he's the father of offspring when there could have been multiple partners much less he doesn't know how the reproductive process works?
gpt
Not all of them do and it depends highly on the animal.  There are some male birds which will "rape" female birds so that the female's mate will raise the child.  Female penguins will actually engage in a form of prostitution where the let other males have sex with them in exchange for rocks to build a nest.  Cuckoo's have evolved so that they can get entirely different species to accept their offspring as their own.

Among many other species, the males just don't care and the burden of child rearing lies on the females.