Darren Martin (UK) has a collection of 441 crab-related items, as of 9 March 2011, that he has been collecting for over 10 years.

Dr Martin did his doctorate on Zinc and Cadmium in the haemolymph of the shore crab, Carcinus maenas. His work is summed up by his friends and family as ‘Darren studied crabs.’ His collection started when he was given a crab pencil sharpener. His website is www.brachyura.co.uk.