FLIGHT Although bird wings are essentially modified forelimbs (arms), they’ve evolved complex dexterity for flight. Birds fly by flapping their wings and steer primarily with their tails. Tail shape affects how rapidly they can change direction (forked tails like those of barn swallows allow the quickest turns). Of course some birds swim (penguins) and others don’t fly at all (ostriches). |
Birds can shorten, lengthen, and adjust the angle of their wings, and spread or close their long flight feathers to fine-tune their flight. They have muscles controlling the position of each individual feather.
Shapeshifting into a hawk, for example, would involve much more than flapping your “arms.” You’d also be constantly tilting and adjusting your wings and tail—and moving individual flight feathers—in response to fluctuating air currents. But wouldn’t it be glorious to fly?! But there's more to being a bird than flying~
Birds process visual information more than twice as fast as humans. As David Allen Sibley notes in What It's like to be a Bird: “where we would see a signpost on the highway as a blur, birds would still be able to see details and track the passing of each post.”
Humans have one focal point (fovea) in each eye and both eyes focus on the same point. Raptors (hawks, falcons, owls, eagles, vultures, osprey) have two fovea on each eye (four total) pointing in different directions, so they see four different areas of detail and have nearly 360 degrees of peripheral vision. They see their prey in detail from great distances, and in all directions simultaneously. |
Our hawk shapeshifter will need to process four sets of visual data (both an overall view and an extreme zoom, on both sides of the head) at more than twice the human-rate of comprehension.
HEARING Owls have very sensitive hearing, and the asymmetrical positioning of their ears (one is higher than the other) helps them pinpoint tiny sounds with exceptional accuracy on both the horizontal and vertical planes. The special design of their feathers allows “air to flow smoothly around the wing allowing nearly silent flight so prey can’t hear them and they can use their acute hearing to help locate prey.” (Sibley) An owl shapeshifter must process a very different method of hearing since humans hear only on the horizontal plane. |
Birds can “read the stars, track the sun, hear infrasound [very low frequency noises], follow smells . . . and detect polarized light, which gives clues to the position of the sun even when the sun is not visible.” (Sibley)
Even more incredible is their “sixth sense” that helps them detect the orientation and slope of the earth’s magnetic field “like a GPS map. [A] chemical mechanism based in the eye provides the compass, while the magnetic receptors in the beak provide the map. The compass may detect the direction of the magnetic field while the map detects the strength, and by integrating both types of information the birds navigate home.” (Birkhead) |