'Piece of joy': Baby born on 9/11 at 9.11pm and weighing 9lbs 11oz

Hide and squeak: Rats 'jump for joy' while playing game

Ig Nobel Prizes: Nappy-changing tech leads the way at spoof ceremony

Speed and stripes could help footballers like in animal kingdom - study

Grumpy ghost crabs growl at enemies using teeth in stomach

Two-headed rattlesnake, named 'Double Dave', found in New Jersey