(I) Are humans the only primates that cry? (II) The answer depends on how you define “crying”. (III) If it is defined as tears coming from the eyes, then the answer is yes. (IV) Others take a conservative stance and say that it is too difficult to tell whether or not non-human primates have feelings. (V) However, if crying is vocalization that occurs under the conditions of distress, then you can find crying in almost all primates.