Humans can be pretty good at exchanging information with only the most subtle body movements.
None really since proper telepathy, defined as "extrasensory communication" doesn't exist. There has to be some physical way to send and recieve information and the ability to pick up a physical signal is what a sense is. So if something communicates it's always sensory.
If a species used radio communication, I don't think I'd be against people calling it telepathy.
Cat and dog. Telepathy is a skill that allow a user to communicate without speaking or body language, my cat doesn't even need meowing and i just know she want food. Some naysayer will claim it's because she sit in front of her food bowl but those are just unfounded claim.
No expert here, but Toxoplasma gondii come to mind.
