2 Metaphors for baffling

Not the least baffling of these are the disproportionate numbers of males and females in certain kinds of animals, their unequal development, as well as the extraordinary difference between the sexes among certain species, so that they seem as distinct from each other as if they belonged to separate groups of the Animal Kingdom.

Baffling, too, are the mysteries of number combination.

2 Metaphors for  baffling