Linux mascot Tux the penguin hits 30 years old — Linus Torvalds outlined the design of the 'slightly overweight penguin' on May 9, 1996 (opens in new tab)

The contented penguin had to be overweight like it had eaten a bucketful of herring, as the only other kind of happy penguin is one that has ‘just gotten laid,’ reasoned the Linux supremo.