Is that what I think it is?

San Francisco has been significantly affected by global warming, which results in natural
disasters such as sea-level rise, flooding, and earth fissure. The city sank underwater. All remaining buildings were occupied by large trees and plants. Such an environment created a perfect habitat for a new bird species, San Francisco Birds, the most dangerous creature in the air. San Francisco Birds has evolved from the eagle with a large wing span to 5 meters. The unique wing shape allowed them to fly through the building gaps even with the wings being folded. During the mating season, the female bird would dance and display their feathers and talons for courtship. Both male and female birds had a pair of strong talons for lifting and catching the prey. As an omnivorous tetrapod animal, San Francisco Birds consumed a large range of creatures, including baby owls, raccoons, rats, tunas and seagulls. Although San Francisco Bird was at the top of the avian food chain, baby birds were vulnerable. Raccoons and snakes were the common predators of the baby birds. Thus, San Francisco Birds would live in the nest until the juvenile age until they had obtained all hunting traits from the parents. At the age of nestling and chick, San Francsico Birds would be exposed to the outside of the nest to learn the basic hunting traits, such as catch the rats nesting in the buildings.