 All of these prey are midwater residents that use photophores and migrate to the surface during the night to feed; thus it is assumed that Bonin petrels are nocturnal feeders that seize prey at the surface while resting on the sea or in flight.Bonin petrel eyes contain high levels of the pigment rhodopsin which aids nocturnal vision.The Bonin petrel is usually solitary at sea, but is occasionally seen in large multi-species flocks.