Blue-footed booby, Galápagos Islands, Ecuador (© Karine Aigner/TANDEM Stills + Motion)

When romance calls, this bird lifts one bright blue foot, then the other, like it's auditioning for a talent show with very strict colour rules. Not metaphorically. Literally. Meet the blue-footed booby. Widely associated with the Galápagos Islands, these seabirds range across the eastern tropical Pacific.