Skyseals

Skyseals are a family of pinniped relatives that are mostly airborne, only to come to the ground (or occasionally on tall buildings or mountaintops) to rest or breed. Just like skycetaceans and a Skymanatee, they have an organ filled with helium in order for skyseals to "swim" in the sky. They range from the size of a dachshund dog to the size of a semiaquatic elephant seal, with all known species of skyseals resembling each kind of semiaquatic seal species, from seals, to sea lions, to fur seals, to walruses. All species of skyseals are carnivorous, but fortunately for us, they feed only on small flying birds on some insects such as dragonflies. They are very peaceful and seem tame towards humans, es, and other sapient beings. None of the skyseal species are endangered as they are adapting extremely well to human settlements and aren't hit by many vehicles, can even avoid getting hit by boats or planes due to their speed. In human settlements, humans (especially poachers) aren't allowed to hunt any animals, including skyseals, so the skyseals are completely safe in human settlements.