Hummingbirds are a diverse family of over 300 species. They have feet so tiny that they cannot walk on the ground, and find it awkward to shuffle along a perch. Hummingbirds eat nectar for the most part, although they may catch an insect now and then for a protein boost. Their super fast wing beats use up a lot of energy, so they spend most of the day sitting around resting. To save energy at night, many species go into torpor.
The vervain hummingbird lays claim to the world's smallest bird egg, just 1cm long and weighing a mere 0.3g.
Source: http://www.bbc.co.uk/nature/life/Hummingbird
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