Nature is kinkier than you might imagine

This is an "old" article (2011), but I just read it for the first time.  It describes a whale mating threesome.  Not only that, it's really a whale DP.  If you know what that means.

I found that interesting.  And the accompanying picture.  This explains "DP", if you don't know what that means.

Whale ménage à trois: now with 1,000-kg testes!