The Weebill (Smicrornis brevirostris) is a small, approximately 9cm long, olive-yellow songbird with a grey bill, brown wings, pale yellow eye and grey feet. Its tail feathers are brown with black bar and white spot on tip of all inner webs but the central pairs. Both sexes are similar. The Weebill is the only member of genus Smicrornis; gene flow is strong and local variation follows Bergmann's and Gloger's Rule.

Australia's smallest bird, the Weebill is distributed to the woodlands and forests throughout mainland Australia. The diet consists mostly of insects and larvae. The female usually lays between two to three brown-speckled cream-colored eggs.

Widespread and common throughout its habitat range, the Weebill is evaluated as Least Concern on the IUCN Red List of Threatened Species.