The use of tools by animals has always fascinated the human mind. One of the well-known examples relates to the Egyptian vulture, capable of using rocks to break into eggs. More than 30 years ago, the famous Spanish naturalist and film-maker Felıx Rodriguez de la Fuente filmed a well-known sequence showing just that. More recent pictures illustrating a similar scene (with a bird breaking an ostrich egg) appear now in the latest edition of Aves y Naturaleza, the magazine of SEO (Sociedad Espanola de Ornitologia). The photos were taken by Eduardo Vinales at the base of the Pyrenees, in the Aragon province. See here