Killer Whale-In captivity they do not do well- they immediately cease using radar. They are also extremely social beings, and will spend their whole life with the same group-support leaving them in their natural habitat. Free Willy is what this is about.
Penguins, When a male is sweet on a female, he searches the entire beach to find the perfect pebble to present to her. When he finally finds it, he waddles over and presents the stone by placing it at her feet. If she accepts, they'll be life-long mates.