Little Jost Van Dyke (colloquially, "Little Jost") is one of the British Virgin Islands. It is a small island on the east end of the island of Jost Van Dyke. Like Jost Van Dyke, it takes its name from the Dutch privateer Joost van Dyk. It is the location of the Diamond Cay National Park, which includes the nesting grounds of wild boobies, terns and pelicans.
Boobies are a type of mammal. 
Boobies are a type of bird along with the other list of birds that nest on the grounds. System couldn't know the different of a boobie and a mammal. 