When we think of shifters in paranormal romance we typically think of bears, wolves, etc. However, the world of shapeshifting opens up a lot of possibilities for the reader and for author’s imaginations.
For example, Amelia Atwater-Rhodes’s Hawksong introduces Danica, an avian shapeshifter and her nemesis/love interest, Zane, a cobra shapeshifter. Hawksong is a young adult paranormal with a Romeo and Juliet set-up. Atwater-Rhodes doesn’t stop there; her follow-up books in the series include wyverns, wolves and falcons.
Avian shifters aren’t unusual to young adult or adult romance. Nalini Singh has included them in her Psy-Changeling series, and one of my favorite side characters of hers is Tijan, the Rat. Nevertheless, avian shifters are unusual enough that they’re worth talking about, and even more unusual is an avian shifter gay romance, such as Kim Dare’s Avian Shifter series. The avian shifters have a clear class system, as demonstrated in Duck!, Magpie and others. Usually the weaker bird of the two is the sub (these books include BDSM, also) and the stronger bird like a hawk or predator bird is the dominant.