I know of 3 little birds .... No I don't ... But there's rarely any new questions on here anymore and I like music Q's ...
What is the smallest bird that isn't a hummingbird?
The Little Woodstar (Acestrura bombus) of Ecuador and northern Peru
Dear Rex Stutznegger,
One tiny bird I love very much is the Pacific wren...I always called it a winter wren but now the Internet says the two species are found to be different!
The Pacific wren is about the size of your thumb; like hummingbirds, they are VERY aggressive, protective of their territory, challenging and defeating much larger birds.
Oh, and for the benefit of all us refugees from Ask.com, the name for a group of them is a CHIME of wrens...
Beside the Pacific wren, here is the world's smallest bird...the bee hummingbird (according to Pinterest), a full two inches, or 5 cm, from tip of beak to tip of tail...
The Weebill (Smicrornis brevirostris)
Length: 8 to 9 cm, Weight: 6 g
It is an Australian bird mostly found in the woodland of middle Australia. They spend most of their time searching for insects and larvae in the woods, trees, etc. Female lays two or even three cream-colored eggs at a time. With a weight of just 6gms Weebill is the 2nd smallest bird in the world (next to bee hummingbird).
Source: http://alltoptens.com/top-10-smallest-birds-in-the-world/