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Hermit Crab

HomeMarine InvertebratesHermit Crab

Hermit Crab

Pagurus bernhardus

Hermit Crabs have a soft abdomen and must occupy empty snail shells for protection, “upgrading” to larger shells as they grow. On Lihou, you can see them hiding among rocks – though they can be hard to spot as they can be mistaken for the shell that they occupy. Unlike many crabs, they do not have a fully protective carapace at the rear, making shells crucial for survival.

  • Habitat: Sandy or rocky pools, typically where empty shells are available.
  • When to See: Throughout the year, but more noticeable in late spring/summer.
  • Length: Body up to ~5 cm, depending on species/shell size.