While humans have three color cones in the retina sensitive to red, green and blue light, birds have a fourth color cone that can detect ultraviolet light. A research team trained wild ...

The female Green Honeycreeper bird is appropriately enough colored green, whereas the male is blue. So, what happens when a Honeycreeper is half of each sex? Well, as recently taken photos show us ...

This ‘Extremely Rare’ Bird Is Half Female, Half Male The green honeycreeper is only the second of its species ever observed with this condition—and the first recorded in more than 100 years ...

GREEN BAY, Wis. — Bird-watchers are flocking to northeastern Wisconsin in the hopes of glimpsing a southern shorebird last seen in the state almost 180 years ago. Logan Lasee, a member of the ...

Bird watchers are flocking to Green Bay, Wisconsin, with hopes of seeing a rare southern shorebird that hasn't been seen in the state in 180 years. ( Jessica Rinaldi/The Boston Globe via Getty Images) ...