Ele vai além da simples capacidade de se comunicar com a própria "espécie". Sirius é capaz de se comunicar de alguma forma com Crookshanks quando ele se transforma em um cachorro (PoA, Capítulo XIX).
Lembre-se, Crookshanks é meio Kneazle, o que o torna muito mais inteligente que o gato normal. Não obstante, os conceitos que Sirius e Crookshanks comunicam entre si são notavelmente avançados.‘This cat isn’t mad,’ said Black hoarsely. He reached out a bony hand and stroked Crookshanks’s fluffy head. ‘He’s the most intelligent of his kind I’ve ever met. He recognised Peter for what he was straight away. And when he met me, he knew I was no dog. It was a while before he trusted me. Finally, I managed to communicate to him what I was after, and he’s been helping me ...’
‘He tried to bring Peter to me, but couldn’t ... so he stole the passwords into Gryffindor Tower for me ... As I understand it, he took them from a boy’s bedside table ...’
‘But Peter got wind of what was going on and ran for it ... this cat – Crookshanks, did you call him? – told me Peter had left blood on the sheets.'
Então eu diria que sim, parece ser o caso que o Animagi pode comunicar idéias complexas e abstratas com outros animais. O fato de que Sirius diz que ele "conseguiu" se comunicar com Crookshanks provavelmente indica que não é automático como Parseltongue.