Yes, indeed, cows can leap.

You know the nursery rhyme:

 Hey diddle diddle 

The cat and the fiddle 

 The cow jumped over the moon. 

 The little dog laughed 

 To see such sport 

And the dish ran away with the spoon. 

 Modern Farmer magazine, which is currently celebrating "Cow Week," took a good, hard look at the bovine portion of that rhyme. Tyler LeBlanc wrote this expose of sorts, and NPR's Wade Goodwyn asked him whether a cow jumping over the moon is as ridiculous as a cat playing the violin.
Here's what he says.