Julian Hume / Illustration of extinct Ralph's crake (Porzana ralphorum) feeding alongside Lightfoot crabs (Grapsus tenuicrustatus) in a coastal forest. O'ahu, Hawaii.

David Tipling / Natal lightfoot crab (Grapsus tenuicrustatus) resting on rocks along the shore, Wizard Island, Cosmoledo Atoll, Seychelles.

David Fleetham / Thin shelled rock or grapsid crabs (Grapsus tenuicrustatus), Fiji.

David Tipling / Natal lightfoot crab (Grapsus tenuicrustatus) Wizard Island, Cosmoledo Atoll, Seychelles

David Tipling / Natal lightfoot crab (Grapsus tenuicrustatus) close up of legs, Wizard Island, Cosmoledo Atoll, Seychelles

David Tipling / Natal lightfoot crab (Grapsus tenuicrustatus) Wizard Island, Cosmoledo Atoll, Seychelles

Tim Laman / Many-coloured Fruit Dove (Ptilinopus peroussi) female in rainforest, Viti Levu Island, Fiji. Endemic to Fiji, Samoa, and Tonga.

Tim Laman / Many coloured fruit dove (Ptilinopus peroussi) male in rainforest, Viti Levu Island, Fiji. Endemic to Fiji, Samoa, and Tonga.

Tim Laman / Many-colored Fruit Dove (Ptilinopus peroussi) female foraging in rainforest, Viti Levu Island, Fiji. Endemic to Fiji, Samoa, and Tonga.

Tom Vierus / Many-colored fruit-dove (Ptilinopus perousii) female, perched in tree, Turtle Island, Yasawa Islands, Fiji.

Tom Vierus / Many-colored fruit-dove (Ptilinopus perousii) female, perched in tree with a berry in beak, Turtle Island, Yasawa Islands, Fiji.

Joel Sartore / Photo Ark / Many-colored fruit dove (Ptilinopus perousii) male profile, Toledo Zoo. Captive.