how is the birds body suited for flying
Answers
Answer:
The bodies of birds are adapted for flying. Many of a bird's bones are less dense than human bones, which makesbirds' bodies lightweight. Flying birdshave large chest muscles that move the wings. Birds have feathers that help themfly.
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Birds all share some characteristics. All birds are warmblooded, or endothermic, animals. Birds are vertebrates because
they have backbones. All birds have a four-chambered heart, a
characteristic they share with mammals. All birds lay hardshelled eggs. Birds have only two legs. Their forelimbs have
become modified into wings for flying. All modern birds evolved
from ancestors that could fly. Some modern birds, like penguins
and ostriches, don't fly today. But they still have feathers and
wings. Feathers probably evolved from reptiles' scales. Both
feathers and scales are made of the same tough material as your
fingernails. Birds' feet and legs have scales on them.
2
The bodies of birds are adapted for flying. Many of a bird's bones are less
dense than human bones, which makes birds' bodies lightweight. Flying birds have
large chest muscles that move the wings. Birds have feathers that help them fly.
The long flight feathers on the wings and tail help birds balance and steer. In
addition, birds have a system of air sacs in their body that connect to the lungs. The
air sacs enable birds to extract much more oxygen from each breath of air than
other animals can. Birds need extra oxygen to release large amounts of energy to
power their flight. Their four-chambered heart also helps a bird get more oxygen.
The advantage of a four-chambered heart is that there is no mixing of oxygen-rich
and oxygen-poor blood. Blood that arrives in the bird's body tissues has plenty of
oxygen.
3
Birds also have well-developed brains and keen eyesight. In order to fly, birds
must have very quick reactions. When approaching a tree or cliff, a bird has only a
few seconds to spot a place to land safely and avoid crashing. Most birds have
keener eyesight than humans do. Birds' eyes are much larger in relation to their
body size than humans' eyes.
4
In addition to adaptations for flight, birds have other adaptations for living in a
wide variety of environments. The shapes of their legs, wings, claws, and beaks fit
the kind of environment that the bird lives in. Wading birds like herons and cranes
have long legs and toes. Goldfinches have toes that can automatically lock onto a
branch or other perch.
5
All birds have jaws that are beaks or bills. Beaks are the tools that birds use to
capture, gather, and eat their food. Many bird beaks work just like utensils you
may have in your kitchen. Birds that eat seeds and nuts need a nutcracker, and that
is just what finches, sparrows, and parrots have. Their short, stout beaks are strong.
They even have ridges on the inside of their beaks like the ridges on a nutcracker.
The ridges help hold and put pressure on the seeds, making it easier for the birds to
open seeds and nuts.
6
Woodpeckers eat insects under tree bark and inside trees. They need a bill that
is sharp, pointed, and chisel-like to pull tree bark apart and drill holes in trees.
Their beaks are strong and work like ice picks.
7
Hummingbird beaks are long, thin, and round. This shape helps them to probe
in flowers and suck out nectar. Their tongues are also special. The tongues roll in
at the edges and have hair on the tips. The hairy tips help hummingbirds lap up
nectar, and the rolled edges give them a trough to carry the nectar to the back of
their mouths.
8
Charles Darwin, the man who proposed the theory of evolution by means of
natural selection, studied the differences in finches on the different Galapagos
Islands. He noticed that each species of finch had a beak that was well-suited to the
diet of the bird. Finches that ate insects had sharp, needle-like beaks. Finches that
ate seeds had broad, strong beaks.
9
There have been over eight thousand species of birds identified. They are the
most diverse class of land-dwelling vertebrates. Birds range in size from tiny
hummingbirds to giant ostriches. Birds live on all continents, including Antarctica!Birds all share some characteristics. All birds are warmblooded, or endothermic, animals. Birds are vertebrates because
they have backbones. All birds have a four-chambered heart, a
characteristic they share with mammals. All birds lay hardshelled eggs. Birds have only two legs. Their forelimbs have
become modified into wings for flying. All modern birds evolved
from ancestors that could fly. Some modern birds, like penguins
and ostriches, don't fly today. But they still have feathers and
wings. Feathers probably evolved from reptiles' scales. Both
feathers and scales are made of the same tough material as your
fingernails. Birds' feet and legs have scales on them.
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