A wildlife rehab in Australia puts sweaters on penguins to help keep them alive and warm during oil spills. They’re always welcome to sweaters, though they aren’t urgently needed. Excess, wrong size and wrong yarn get sold to raise additional funds for their efforts. It’s adorable and a good cause. Patterns for knit and crochet are on their site, People get really creative with these. I saw one little penguin sweater that was a superman costume, so have fun.