50 Stone Canary

The Fifty-Stone Canary (aka 50-Stone Canary, Big Bird, etc.) is a Animal-based weapon introduced in Worms Forts: Under Siege. A whopping great bird with a severe weight disorder, the Canary waddles ever-so-patiently towards the enemy before exploding in a cloud of feathers and smoke. In essence, the Canary is functionally identical to the Sheep, except scaled larger for siege warfare.

Official Description
''Is it a bird? Is it a plane? Well actually you were right the first time - it's a bird, and a very big one at that! Watch him slowly make his way over to the enemy base and hear the cries of, "Aw, isn't he cute..." as he literally explodes in their faces.''

Use
Simply face the direction you want to send the bird, and press the Fire button to deploy it. The Canary will (slowly!) waddle in the direction you were facing, exploding either after you press Fire again, or after its 30-second internal fuse reaches zero.