This video takes a look at our hummingbird friends and caregivers in Brazil. 

Hummingbirds are hyperactive animals, they can move their wings over fifty times per second.  They can do that because they have a strong heart.  Their hearts are 20% of its weight.

They love the nectar, and may eat up to sixteen hours without stopping.  For perspective this is like if we eat 50 kilos (110 pounds) of bread.