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Grade 5 | Science | Respiration in animals, Animals and Birds, Olympiad, CBSE, ICSE, Maths Olympiad, Science Olympiad, English Olympiad
All mammals, birds and reptiles breathe through lungs. There are some animals which live in water or spend most of their time in the water but are actually mammals and breathe through lungs. E.g. Whales, dolphins, sea lions, crocodiles etc.
Aquatic animals breathe through gills. E.g. Fishes, octopus etc
Tracheael Breathing : Insects also need oxygen for their survival but they don't have lungs like humans and other animals. Insects and some other animals without backbones breathe through a system or network of tiny tubes called tracheae. Their bodies have small holes on their body which are connected to tracheae. These holes are called spiracles. Insects take in oxygen and give out carbon-dioxide. This process of gas exchange in insects is called diffusion.
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