Kitsune no Yosuga
Kokonoe is the last fox in the forest, and one day while patrolling his territory, he happens upon a young bird who fell out of his nest. While Kokonoe initially picks up the bird to eat later as "emergency rations," he eventually can't let go of the child and decides to raise him as his father, giving the child the name Yosuga. But when Yosuga the hawk grows up, he and Kokonoe both start to yearn for a deeper connection between them, despite the barriers of species and gender, and Kokonoe feels he's stealing from Yosuga what it means to be a hawk, so he must let him go. If you're squeamish about incest themes, do not read. Otherwise, I think it's a fairly touching and interesting story with beautiful art. Trigger warning: incest themes (adopted parent x child)
Toritan
Inusaki is just a self-proclaimed detective who's really working as more of a fix-it who happens to have the ability to talk to birds. One day, he ends up talking to a cool crow he nicknames Kuro, and before he knows it, he's fallen for a crow! When the crow rejects him, his landlady' son, Mitsuru, ends up checking on him, and soon his feelings shift to the cute high schooler Mitsuru who he's sure has a girlfriend already. But Mitsuru has a secret of his own. Cute. No trigger warnings.
Hyper Love Power
In a world where basilisks and cockatrices secretly live among humans, an innocent cockatrice named Sora is sent to a school full of basilisks on a secret mission to get close to the student council president, Rin, but he immediately forgets his mission and falls in love with Rin's delinquent brother, Kai, instead. It was a bit chaotic and wacky, but I liked what I read of it. Still, I only read through chapter 5 because it felt like a good stopping point. Trigger warnings: violence, abduction.
Oyasumi, Itoshiki Kotori-sama