Mutualism is a relationship between organisms where both benefit.
Frigate birds are truly champion fliers. The birds can fly for weeks without stopping. How do they do it?
According to birding lore, two of America's most invasive bird species were introduced by a misguided Shakespeare fan named Eugene Schieffelin.
In the years after his presidency, Roosevelt sent a letter to The Condor magazine criticizing painter Abbott Thayer's theory of animal camouflage.