Why would deer respond to human infant cries?
Two deer species have been found responding to distress cries of other species, including seals and humans. Why? These sounds all share some common sound structures and patterns, but the deer only responded when the frequency of non-deer cries was similar to that of their own infants. Structure and pattern may be a universal way to detect "someone is in danger" - and it may be helpful to know there is danger in the area, even if those making the calls are a different species. Read more here.
