IGCSE Biology 4th edition

Biology books by
D G Mackean

Birds. Chaffinch

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Bird. Chaffinch
Birds are vertebrates - they have a vertebral column and a skull. They are 'warm blooded'; that means they maintain their body temperature at a constant level and above that of their surroundings. Their chief distinguishing characteristics are that they have feathers and their forelimbs are modified to form wings.

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