Hummingbirds are a family of birds (Trochilidae) composed by many species.
The size of the hummingbirds varies depending on the species: the smallest weighs about 2.2 grams and the largest about 20 g.
They feed on flowers’ nectar (they are important pollinators) and small insects.
They have a very large heart beating at more than 1000 beats per minute (in humans the average is 70).
A hummingbird can travel 6400 km annually, reaching 80 km/h and is the only bird that can fly forward, backward and sideways.
They can flap their wings up to 200 times per second!
They live in regions of the American continent situated between 0 and 5000 m of altitude.
The hummingbird Mellisuga helenae lays the smallest known egg, with 11.4 mm long, 8 mm in diameter and a weight of 0.5 g.