A visibly agitated Dawkins then climbed onto the roof of the bishop’s house and threw fossils at passers-by until a police marksman was able to stun the eminent naturalist with a tranquiliser dart.
An Oxford University spokesman said: “Easter is a particularly trying time for Richard.
“Everywhere you go there are crosses and religion and stuff, and we have to keep a very close eye on him as he’s liable to go completely Cuculus Canorus.
“Last year he filled a pterodactyl egg with fun-size Mars Bars and threw it at Sister Wendy Beckett. And in 2010 he rode a donkey to Canterbury dressed as a trilobite.