Translation of "Mollusks" in French

All the mollusks she is capturing, they're quite easy to catch, but they've got these incredibly hard shells.

Les mollusques sont faciles à attraper, mais ils ont des coquilles très dures.

But some of these mollusks will only relax if that drill is precisely in the apex of the shell, on the abductor muscle.

Certains de ces mollusques ne se détendent que si leur coquille est percée à son sommet, sur le muscle abducteur.