Bonin Petrel (Pterodroma hypoleuca) [XC116223]
by david m from Sand Island Midway Atoll, United States (call, flight call)
Bonin Petrel (Pterodroma hypoleuca) [XC862221]
by id from Volunteer House, Sand Island, Midway Atoll, United States (call, flight call)
Subspecies
Usually forms part of assemblage referred to as subgenus Cookilaria. May form superspecies with Stejneger's Petrel (Pterodroma longirostris), White-winged Petrel (Pterodroma leucoptera) and Pycroft's Petrel (Pterodroma pycrofti). Has been considered conspecific with Black-winged Petrel (Pterodroma nigripennis) or Chatham Petrel (Pterodroma axillaris).