expectant dads get fat + parable of hats

New Scientist reports on research in Biology Letters, demonstrating that, in marmosets and tamarind monkeys at least, dads-to-be put on weight during pregnancy as well as the mothers. The hypothesis is that the extra weight gain (about 10%) provides an energetic reserve for when the infants are born and dad has to cart them about on his back.

Pharygula has the most marvellously satiric parable: Planet of the Hats.