Sun compass in animals internal clock to determine their heading, and that they had learnt the actual direction down to the sea on their particular beach. Lockley's experiments with Manx shearwaters ("Puffinus puffinus") showed that when released "under a clear sky" far from their nests (in Skokholm), the seabirds first oriented themselves and then "flew off in a direct line for Skokholm", making the journey rapidly. For example, one of the birds, released at Boston airport, arrived in Skokholm 12½ days later; Lockley calculated that if the birds flew for 12 hours per day, they must have travelled at 20 miles per hour, their
Antipsara is a nesting site of the European shag ("Phalacrocorax aristotelis"), Eleonora's falcon ("Falco eleonorae"), Cory's shearwater ("Calonectris diomedea"), and the yelkouan shearwater ("Puffinus yelkouan"). Antipsara Antipsara () is a small Greek island in the Aegean Sea. Antipsara had 4 inhabitants according to the 2011 census. It lies about west of the larger island Psara, from which its name is derived. Geographic conditions make it inaccessible from the north and west side. Evidence exists of settlement in ancient Greek and Roman times. During the Ottoman rule the island served as a port. Nowadays, tourist trips to the island originate from Psara