On the persistence of variation in horn size among Soay sheep

(BBC News)

The small-horned rams are fitter, 
but the big-horned rams are phatter
And though we deemed it sweeter
To dally with the latter,
The small horns still stay with us
To Scottish boffins’ wonder;
In flocks the nerds still pull the birds
When the jocks are six feet under

(After Peacock)