Las aves tiene patas para caminar y alas para volar. Pero las hay que solo vuelan o solo caminan pues sus patas o sus alas están poco desarrolladas.
Por ejemplo, presentan patas subdesarrolladas los venejos que, en cambio, son volátiles extraordinarios.
Por el contrario, tienen alas subdesarrolladas, inadecuadas para el vuelo, numerosas aves.
Entre estas están las avestruces y las gallinas que solo pueden dar algún que otro salto con las alas desplegadas ya que tienen el cuerpo demasiado pesado respecto a las alas.
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