1.   Despite the obvious differences, mice are quite similar to people at the genetic level and provide valuable insights into their fellow mammal.

2.   Growing evidence shows that the big animals are killing fellow mammals in droves, wielding their beaks as clubs and slashing away with rows of sharp teeth.

3.   I was happy to leave it, to get back to my fellow mammals.

4.   People do this without thinking, and almost any fellow mammal will trip the reflex.