Speaks in Squeaks
All Ratkin share a rodent language that only they can understand. This can be used in any form. Ratkin in Rodens form can be quite verbose; wererats in Crinos form limit themselves to simple sentences of a few crude words. Ratkin in Homid form are very careful where they use this rodent language — it's most unnerving when a rat disguised as a human starts chittering, nattering, clicking and whuffling.