The same Nazca Booby again (Sula granti) panting in the heat: note the two parasitic flies on the other side of its neck. Darwin Beach, Genovesa, Galapagos Islands
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The same Nazca Booby again (Sula granti) panting in the heat: note the two parasitic flies on the other side of its neck. Darwin Beach, Genovesa, Galapagos Islands
All three flies from these two images are oriented in the same way: vertical with head at the top when the booby's neck is vertical too. Is this a coincidence or typical, and why?