They are very small hummingbirds. The smallest in the world, in fact, at only 5-6cm long and weighing 1.6-1.9 grams. For those non-metric folk, that's about the weight of two regular paperclips. Can you imagine that?! After having a Fiery-throated Hummingbird land on my finger in Costa Rica and only feeling his teeny claw tips I can't IMAGINE how this would feel-
I doubt you'd even feel him!
Hummingbirds are unique in their flight pattern, flapping their wings in a figure eight pattern. This allows them to hover in the air as well as fly backwards. Bee hummingbirds can flap their wings up to 80 times a second. When males participate in courtship this number can increase to 200 times per second! They can fly for up to twenty hours nonstop, much of this time is spent searching for food, mainly nectar.
Just like most other species in the world the bee hummingbird is listed on the IUCN Red List as Near Threatened. They are no longer found in much of their historical range due to habitat loss to agriculture and introduced predators.