Male and female Blue-Footed Boobies look almost identical, but you can tell them apart by their eyes.
What is a Bird?
What makes a bird a bird? How could you look at an animal and say “that’s a bird,” without any doubt in your mind?
Male and female Blue-Footed Boobies look almost identical, but you can tell them apart by their eyes.
What makes a bird a bird? How could you look at an animal and say “that’s a bird,” without any doubt in your mind?