The bones in a bird are unlike other animals in that they're hollow, meaning they weigh much less for their size than other animals. Also, the feathers on the birds body, also very light, help capture wind better than fur can, for example, promoting flight.
The circulatory system provides birds with energy to fly and maintain high levels of activity. The respiratory system provides birds with oxygen and also enables flight.
The "lift" is from the wing movement, but the real ability for a bird to fly is the fact that their bones are hollow and this makes them much lighter so that they can get lift-off.
-Rinkumiah
they all work together and help the bird fly because a birds lungs connect to the air sacs that provide a constant supply of oxygen to the blood and make the bird more lightweight.
The circulatory system provides birds with energy to fly and maintain high levels of activity. The respiratory system provides birds with oxygen and also enables flight. The "lift" is from the wing movement, but the real ability for a bird to fly is the fact that their bones are hollow and this makes them much lighter so that they can get lift-off. -Rinkumiah
birds of a feather stay together
In the nursery rhyme "Birds of a Feather," the birds will flock together.
Birds of a feather flock together, but all birds cannot fly.
A flock typically refers to a group of birds, particularly small birds like sparrows or pigeons, that move together in coordinated flight. However, the term "flock" can also be used more broadly to describe any group of animals that move or gather together, such as a flock of sheep or a flock of geese.
A Flock of Birds means a lot of bird flying together
Contract and relax to enable movements and flight.
Avifauna.
is the current taxonomic system accepted completely in scientific circles?
Birds of a feather are said to "flock together".
"Birds of a feather flock together."