Which animal has no legs but can fly and swim?

The animal that fits this description is the bird known as the flying fish. While it doesn’t have legs in the traditional sense, its fins allow it to glide above the water's surface, giving it the ability to "fly" for short distances. Additionally, it is an adept swimmer, utilizing its fins to navigate through the water. Another example is the octopus, which can "fly" in the sense of moving through water with jet propulsion, but it does not truly fly in the air.