noun, masculine/bɛʁ.naʁ.l‿ɛʁ.mit/
hermit crab
“1896, Revue des Deux Mondes, volume 134, “Une correspondance inédite de Prosper Mérimée”, part 3, p. 572” — Do you know, Madame, what a hermit crab is? It is a very small crab, three centimeters large at most, whose tail is devoid of scales.
Borrowed from Occitan bernat l’ermita (literally “Bernard the hermit”), probably named after Bernard of Clairvaux.