10 Smallest Birds in the World Ranked

Willow Tit
Willow Tit, a species of bird that has suffered a dramatic population decline over the past thirty years across Europe, and esp in Britain where it is an RSPB 'red status' bird. This image shows features that may differentiate it from the similar, but more common, Marsh Tit Poecile palustris: sooty cap, untidy bib, pale wing panel, larger white cheek, lack of pale patch on upper mandible. A definitive ID is usually obtained from its call.
Francis C. Franklin / Wikimedia Commons / CC BY-SA 3.0

Despite its small size, the willow tit likes cold weather. Found in sub-arctic Europe and northern Asia, the willow tit is a tiny 4.5 inches long on average and weighs 0.31 to 0.38 ounces — making it about the same size as its neighbor the marsh tit. They look almost exactly alike as well. They do, however, have very different vocalizations.
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