Las primeras aves aparecieron hace millones de años, a partir de un grupo de reptiles. Las escamas de su cuerpo se modificaron dando lugar a las plumas, excepto las de las patas, que permanecieron intactas. Algunas de las adaptaciones que sufrieron son: Reducción del peso corporal, con un esqueleto hueco y un pico ligero […]
Morfología de un periquito Leer más »
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