C. pagurus is a nocturnal predator, targeting a range of molluscs and crustaceans.
From the en.wikipedia.org
Attempts have been made to introduce H. gammarus to New Zealand, alongside other European species such as the edible crab, Cancer pagurus.
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Type genus of the family Paguridae
Pagurus is a genus of hermit crabs in the family Paguridae. Like other hermit crabs, their abdomen is soft-shelled and sheltered in a snail shell. These marine decapod crustaceans are omnivorous, but mostly prey on small animals and scavenge carrion. ...