In addition to what others have said (humans having big heads), wild animals generally don’t try to express that they are in pain. It makes them a target for predators. Social animals can be kicked out of their groups for being sick or hurt. If a deer giving birth was screaming out or moving slowly due to contractions then it’d be easy for something like a wolf or coyote to come and take advantage of their weakened state.
It can extend to pets too, sometimes animals will look/act fine and turns out they have been hiding it and are much worse than they appeared.
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