Joan Mayol

Cap del Servei de Protecció d’Espècies del Govern de les Illes Balears. Palma.

Planetary geography and bird migration «Mobile organisms occupy territories with abundant resources, take advantage of them in order to breed, and leave when unfavourable conditions

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We have been aware from the 19th century of the importance of predation and rivalry between species in nature as predominant forces for natural

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