Flying birds are not always larger. There are many bats bigger than many kinds of birds.
There are a few reasons. First and foremost a bird is lighter than a bat of the same size. Birds have hollow bones, which makes their skeletons very lightweight. Second, flying requires a lot of energy, and the bigger the animal the more energy it takes. Birds have a complex respiratory system that is more efficient than that of any mammal to meet these energy needs. Finally, the largest birds are mostly gliders. The largest flying birds are primarily gliders. The airfoil shape of a bird wing is better suited for long glides than the membrane wings of a bat.
The only mammals that can fly are the bats, but there are many more than 20 kinds of bats.
no
The birds flying today is an bird that is rather large bigger than a elephant in the animal world it is called an airoplane
Then and NowToday we would define a bat as a mammal. In the time during which the list of unclean "birds" was given, though, it's quite possible that the Israelites thought of any flying creature larger than an insect as a bird.Answer
depends, but it's not much of a difference
You are describing the vampire bats, but all three species of vampire bats are somewhat longer than 5 cm.
no more than when flying over anywhere else.
Actually, no animal has scales which can fly, other than perhaps the flying fish. Bats have skin, birds have feathers. Insects would not be considered to have scales either. Pterosaurs flew and may have had scales, but they are now extinct.
Most commonly, yes.
yes
Not necessarily. The parrotlet is a very tiny bird, maybe not bigger than your pinky when they're chilling out. And whatever happened to the Bee Hummingbird? Anyways, evolutions has her own reason for everything.