True Flight:
* Birds: This is the most obvious example, with thousands of species, from tiny hummingbirds to giant condors.
* Bats: The only mammals capable of true flight, using their wing membranes to generate lift.
* Insects: This group includes a vast array of flying insects, like butterflies, moths, flies, bees, and beetles.
Gliding Flight:
* Flying Squirrels: These rodents use skin flaps to glide between trees.
* Sugar Gliders: Similar to flying squirrels, these marsupials glide using their skin flaps.
* Draco Lizards: These lizards have flaps of skin that act like parachutes, allowing them to glide between branches.
* Flying Fish: These fish don't actually fly, but use their large pectoral fins to "fly" for short distances above the water.
Other forms of flight:
* Spiders: Some spiders use silk threads to "balloon" or float through the air, but they don't have true wings.
* Plankton: Some microscopic plankton can use air bubbles to float and drift, but they don't have active control over their movement.
So, the answer to your question depends on how you define "flying." If you're looking for true flight, then the answer is birds, bats, and insects. If you're looking for any form of aerial movement, then the list includes many more creatures.