My first reaction was one of bewilderment when I saw two male giraffes in an act that seemed like copulation. Well-documented studies have shown that several species engage in same-sex relationships. Male animals that engage in a sexual act with other males are usually teenagers as in the case of these two male giraffes. Young males usually do not get the chance to mate with females because the older, dominant males claim the right to breed. Species that are well known for this include giraffe, domesticated sheep, and cattle.