Guppies, even, show a range of intrepidness. Most, sensibly, will keep their distance when placed near larger fish. A fearless and curious few males, however, will swim toward a potential predator. Not surprisingly, they are more likely to be eaten, but those who are not prove to be more attractive mates to the surviving female guppies. Trepidation cuts both ways.
Kay Redfield Jamison, Exuberance: The Passion for Life