, they have occupied almost every terrestrial niche on the planet. The Depth of the Song
| Aspect | Details | |--------|---------| | | 2–6 (tropical) up to 12+ (temperate). | | Incubation | 10–14 days typically. | | Fledging | 10–21 days, but many are fed post-fledging for weeks. | | Nests | Elaborate: woven (weavers), cup (thrushes), domed (wrens), mud (swallows), cavity (tits, bluebirds). | | Lifespan | Small passerines: 2–5 years (wild); up to 20+ years in captivity (some corvids). | passerines birds
Exception check: Swifts (Apodiformes) look passerine-like but have different foot anatomy and nest differently. , they have occupied almost every terrestrial niche