Here's the first image of Rinji's second summoning animal, Eri the huge and very muscular female feral hawk. Not often you see muscles like that bulging from beneath all those feathers.
Eri is very loyal to Rinji and willing to literally go the distance for him. Likewise, Eri possesses near-human level intelligence and can understand most speech. She is very perceptive of who she meets while with Rinji, and will either warm up to that person or give the cold shoulder accordingly. Speedwise, Eri can fly fast enough to briefly surpass the speed of sound, thanks to her huge muscle-endowed wings. Strengthwise, Eri can support up to three heavyweight anthros of Pachua's size.
When not transporting Rinji for long distances, Eri lives a peaceful life in the surrounding terrains of Alaska, where Rinji himself also lives.