Reader, here is an incomplete list of things you should not try with elephants: a memory contest, jump rope and castration. See, in addition to having uncanny recall and a firm relationship with ...

Seeking an answer, a useful first step is to trace the evolution of descended testes. Testes remain high up in the abdomen in egg-laying mammals (monotremes), but descend in all marsupials, ...

In extreme cases, the testes stay close to their original location near the kidneys, but in a common intermediate condition the testes descend partially but still remain within the abdomen. This is, ...