In this episode, Katherine introduces the hummingbird - the smallest living bird, hatched from eggs typically no bigger than ...

A hummingbird sanctuary on the outskirts of Colombia's capital Bogota is providing a picturesque respite from the noise and stresses of big city living.

Measuring a mere 3 inches long and weighing one-tenth of an ounce, roughly the same as a table tennis ball, the Calliope hummingbird is incredibly tiny. In fact, Eric Rasmussen, avian scientist at the ...