1 00:00:00,000 --> 00:00:10,939 Birds 2 00:00:10,939 --> 00:00:14,939 Birds are oviparous. 3 00:00:14,939 --> 00:00:18,940 Birds are vertebrates. 4 00:00:18,940 --> 00:00:22,940 They are hot-blooded. 5 00:00:22,940 --> 00:00:26,940 Birds are terrestrial. 6 00:00:26,940 --> 00:00:30,940 Birds breathe through lungs. 7 00:00:30,940 --> 00:00:34,939 Birds have got four limbs 8 00:00:34,939 --> 00:00:45,500 wings and legs. The leaves are very important to fly. The wings of the birds 9 00:00:45,500 --> 00:00:55,520 can be different depending on the birds. The skin of birds is covered in feathers 10 00:00:55,520 --> 00:01:04,159 and they protect them from the cold and hot. It is easy for them to fly because 11 00:01:04,159 --> 00:01:18,000 their bones are like. Birds haven't got teeth, they have got a beak. There are two birds 12 00:01:18,000 --> 00:01:26,680 that can fly, penguins and the ostrich. Thank you, bye bye!