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Edu-Primes
  • 8/27/2024
Transcript
00:00Some birds you might have seen around are Crow, Duck, Sparrow, Peacock, Parrot, Pigeon,
00:19Hen, Eagle, etc.
00:24Birds are one of those animals that man has always envied because of their ability to
00:32fly.
00:33Let's have a look at the bird's body.
00:44The world's largest living bird is the Ostrich.
00:50Its height is 2.74 m.
00:56It cannot fly.
00:59It weighs up to 160 kg.
01:05The Hummingbird is the smallest bird in the world.
01:10Flight!
01:11A wonder!
01:15The lighter you are, the easier it is to fly.
01:22Even large birds are not very heavy.
01:27Their body is shaped like an arrow, pointed at the head as well as at the tail.
01:38They have light hollow bones.
01:42This reduces their body weight.
01:49There are four types of feathers, namely down feathers, body feathers, flight feathers and
02:09tail feathers.
02:14Down feathers are small and fluffy.
02:20These feathers cover the bird's body and keep it warm.
02:28Body feathers are bigger than down feathers.
02:35Flight feathers are long feathers present on the wings.
02:41They help the birds to fly.
02:46Tail feathers are also long and help the birds to slow down and change direction.
02:58A bird flies by flapping its wings up and down.
03:03All birds depend on the quality of their feathers to keep them airborne.
03:11This inspired man to build an aeroplane.
03:32Shape of a bird's beak depends upon the type of food it eats.
03:41Because birds do not chew their food, they do not have any teeth.
03:48They use their beaks to bite, crush or tear the food.
03:58Curved beak of a parrot helps it in eating fruits and cracking nuts.
04:07Crushing beak of a pigeon helps it to crush grains and seeds.
04:17Tearing beak of an eagle helps it in piercing and tearing the animal's flesh.
04:25Sifting beak of a duck helps it to dig for and filter food from the mud.
04:35Probing beak of a hummingbird helps it to drink nectar from flowers.
04:44Chiseling beak of a woodpecker helps it to peck wood and eat insects.
04:59Just like the beaks, the feet and claws of birds are also shaped to suit their different
05:07ways of life and food habits.
05:13Perching birds like sparrows have long, slender claws with three toes in front and one at
05:22the back.
05:23This helps them to hold firmly on to a branch or a wire.
05:33Scratching birds like hen have sharp and strong claws with three toes in front and one at
05:42the back.
05:44This helps them to scratch the ground in search of food.
05:52Praying birds like eagles have sharp claws to hold their prey while flying.
06:02They also help them in tearing the flesh of animals.
06:10Swimming birds like duck have webbed feet with skin joining their toes.
06:19Such feet help them to paddle in water.
06:26Wading birds like crane have long, thin legs and widespread toes.
06:34These help them to walk in shallow water.
06:41Nests of Birds All birds lay eggs.
06:49They sit on the eggs to keep them warm and hatch them.
06:57The chicks stay in the nest till they learn to fly.
07:04The nest keeps them safe.
07:09Most birds use twigs, grasses and dry thin leaves to make their nest.
07:20Some birds like ducks build their nests on the ground.
07:29Some birds build interesting nests.
07:33The weaver bird weaves a beautiful nest with grass and dry leaves which hangs from a branch.
07:43The nest has an opening at the bottom.
07:49The tailor bird builds its nest with leaves and stitches it with straw.
07:59The woodpecker makes its nest in the hollow of a tree.
08:05It makes a hole in the tree trunk with its hard and pointed beak, lines the hole with
08:14grass and lays its eggs there.
08:20The woodpecker's tongue is so long that it keeps it folded inside its head.
08:31Till the end of 1800 AD, people used bird feathers as a pen.
08:41They used the wing feathers of geese and swans.
08:47These were called quill pens.