The male blue-footed booby has an elaborate mating ritual when it lifts its feet up and down to impress a female (the bluer the better). This one in the Galápagos is standing in the rain because:

It's been rejected as its feet aren't blue enough

Its singing was woeful and it was kicked out of the colony by a disappointed flock of young females

There isn't really anywhere to shelter in the  Galápagos [Note: the name booby comes from the Spanish bobo, meaning stupid]