1) The Swinging Chad
Found: Central, Northern, Circle lines
Breeding times: 8-11AM, 5-7PM weekdays
Behaviour: The Swinging Chad is a much-misunderstood creature. Locating itself firmly in the doorway of a half-crowded carriage, it then remains rooted to the spot, no matter how many people subsequently try to embark or disembark past them. As a result, Swinging Chads are generally mistaken by the ignorant for rude, arrogant tossers who feel it beneath themselves to get out of other peoples' way. But nothing could be further from the truth, as these limpet-like animals are as much a part of the underground system as a broken 'service update' board or posters of MacKenzie Crook's knackered face.