Look out, Lily: A 12-ounce newcomer is eyeing your title as the Oregon Zoo's most adorable baby. Or at least he will be, once he opens his eyes. Tilly, one of the zoo's two North American river otters, gave birth to a male pup Jan. 28 — the first river otter to be born at the Oregon Zoo. The new arrival weighed just over 4 ounces at birth and has already tripled that due to his mother's naturally high-fat milk. Keepers have yet to decide on a name for the pup, though it is likely he will be named after a local river or waterway.