| neural song control system of hummingbirds: comparison to swifts, vocal learning (songbirds) and nonlearning (suboscines) passerines, and vocal learning (budgerigars) and nonlearning (dove, owl, gull, quail, chicken) nonpasserines. | males of certain hummingbird species such as anna's hummingbirds (calypte anna) learn their song during postnatal development. here we report that male anna's hummingbirds and male amazilia hummingbirds (amazilia amazilia), two singing hummingbird species, possess forebrain areas that are similar in morphological appearance, location, and connectivity to the song control areas ra (nucleus robustus archistriatalis), hvc (nucleus hyperstriatalis ventrale, pars caudale, or higher vocal center), and ... | 2000 | 10982462 |
| time-activity budgets and behaviour of the amazilia hummingbird, amazilia amazilia (apodiformes: trochilidae) in an urban environment. | this study deals with the time-activity budgets of amazilia amazilia, a territorial hummingbird, and its preferences for different flower species and perches in the gardens of lima (peru) in september 2001. a. amazilia spent an important part of its time resting on perches (ca. 80%) and only 15.5% for foraging, devoted essentially to flower visitation and only 0.3% for hunting and drinking water. territorial defence accounted for 2% of total time, mostly against coereba flaveola, an introduced n ... | 2006 | 18491628 |
| quantifying the dynamic wing morphing of hovering hummingbird. | animal wings are lightweight and flexible; hence, during flapping flight their shapes change. it has been known that such dynamic wing morphing reduces aerodynamic cost in insects, but the consequences in vertebrate flyers, particularly birds, are not well understood. we have developed a method to reconstruct a three-dimensional wing model of a bird from the wing outline and the feather shafts (rachides). the morphological and kinematic parameters can be obtained using the wing model, and the nu ... | 2017 | 28989736 |