Board Thread:False Info and Speculative Discussion/@comment-4467206-20140619201219/@comment-4091815-20140619212000

You're on the right track K but it's not "All Alphas" who can shift into actually animals.

Alphas all have an additional fully transformed version - Peter, The Twins (merged form) and even Ducalion (although it's not clear if that's his "monster form" or just how a partially transformed Werewolf would look after sucking up the life forms of so many betas) had additional forms.

Only Talia, Laura and Malia have shown the ability to full transform into animals. Deaton says it is a unique ability.