The Bee Hummingbird is just 5-6 cm long and weighs only 1.5-2 grams, smaller than a finger and lighter than a grain of rice, ...

From 9-foot tall ostriches to albatrosses with gargantuan wingspans, here are some of the biggest birds in the world.

Marina Henke: With insects, wings diversify even more. That’s because when you're really tiny, the viscosity of the air ...