The black-tailed white morph is similar, but with a black tail, and can easily be confused with the Nazca and Masked Boobies.
The closely related Masked and Nazca Boobies (Masked Booby and Nazca Booby) are both obligately siblicidal species, while the Blue-footed Booby is a facultatively siblicidal species.
Noteworthy fauna includes several species of seabirds, including the Red-footed Booby (Sula sula), Great Frigatebird (Fregata minor), Lesser Frigatebird (F. ariel), Black Noddy (Anous minutus), White Tern (Gygis alba), Masked Booby (Sula dactylatra), Brown Booby (S. leucogaster) and Brown Noddy (Anous stolidus).
Masked Booby | Blue-footed Booby | Nazca Booby | Red-footed Booby | Masked Owl | Ten Masked Men | Red-masked Parakeet | Masked Mountain Tanager | Booby Dupes | ''Silvesterklaus'' figures. Masked individuals that are part of an old Appenzell tradition that celebrates the New Year (both Julian calendar | Masked Woodswallow | Booby trap | booby trap | Booby | booby | blue-footed booby |
18 species of seabird, the Black-footed Albatross, Laysan Albatross, Bonin Petrel, Bulwer's Petrel, Wedge-tailed Shearwater, Christmas Shearwater, Tristram's Storm-petrel, Red-tailed Tropicbird, Masked Booby, Red-footed Booby, Brown Booby, Great Frigatebird, Spectacled Tern, Sooty Tern, Blue-gray Noddy, Brown Noddy, Black Noddy and White Tern nest on the islands, most of them (16) on Tern Island.