Table 1 The hummingbird’s tracheal dimensions are relatively shorter than in other birds.
From: The vocal organ of hummingbirds shows convergence with songbirds
Bee Hummingbirds | Zebra finch | White-rumped SwiftletC | OilbirdD | |
---|---|---|---|---|
Body mass (BM in kg) | 0.0035–0.01 | 0.015 | 0.010 | 0.419 |
Trachea length (TL in cm) | 0.88 ± 0.12 | 3.3* | 2.2 | 11 |
Expected tracheal lengthA (in cm) TL = 16.77 *BM0.394 | 1.8–2.7 | 3.2 | 2.72 | 11.9 |
Tracheal diameter (TD in cm) | 0.09 | 0.12 | 0.15 | 4.4 |
Expected tracheal diameterA (in cm) TD = 0.531*BM0.348 | 0.074–0.106 | 0.12 | 0.11 | 0.39 |