Deer Mice Sperm Cooperation

Heidi Fisher has discovered that Deer Mice sperm clump together in order to travel faster. What's more:

Fisher wondered whether sperm from two different male mice would cooperate indiscriminately or tend to clump with sperm from the same mouse.

So she took sperm from one male deer mouse, and dyed it red, and sperm from another male and dyed it green.

Then she mixed the two sperm samples together, put them in a petri dish ... and watched what happened.

"What we found more often than not is that red sperm tend to clump more so together, and green sperm tend to clump more so together," says Fisher.