Translation of "Mollusks" in Spanish

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

Todos los moluscos que captura son fáciles de atrapar, pero tienen conchas muy duras.

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

Pero algunos de estos moluscos solo se abren si ese taladro está precisamente en el ápice de la concha, en el músculo abductor.