I've noticed how a monk's Tongue of the Sun and Moon and an oracle's Tongues curse allow them to "speak with any creature" and "speak and understand any language" respectively.
My question is, does this allow them to speak with/understand animals? The spell Speak with Animals is all I could think of as a reference and it doesn't specify if the animals are speaking a specific language or if the magic is just interpreting their emotions and surface thoughts.
Is there a difference between what the spell does and what these class features do? Would they overlap?