Male on male fiddler crab mating?

[Joekline380]

Have only these two male fiddlers in this tank and they have coexisted amicably for 6 months. Caught them in this belly to belly mating position with what appears to be their reproductive parts in action. Not sure what to think of this? Anyone have any knowledge on this or ideas of what is going on?

 

[AaronW]

Haha wow.

 

[owen0992]

Social evolution is what's going on. I wish them happiness together. Lol

 

[Joekline380]

The one on bottom that was being penetrated is now dead.

 

[owen0992]

That sucks.. now it was rape, murder instead. :/