Nightjars. He is called so because it was once thought that it sucked the milk of goats, because it is used to see with cattle in the evening. Only I could see it is having as background the clarity of the sky. In reality are insectivorous birds so they have a very large mouth flying open carrying. I child used to them to see in the evening as a large shadow on the clarity of the sky when they passed the cows along the roads of the monte scaring grasshoppers and other insects. Its scientific name is caprimulgus ruficollis and is a migratory bird, little noticed by the difficulty of doing so, as are blends very well in the field. Seen in ready ( zone of influence of the 41 astur-leones; especially in the summer.
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