The journey's scientific purpose was to secure emperor penguin eggs from the rookery near Cape Crozier at an early embryo stage, so that "particular points in the development of the bird could be worked out".
Aside from anatomical differences such as long bony tails, clawed hands, and teeth, the slow development of the first birds would have made their biology appear unfamiliar to ornithologists.
In a population of house sparrows, Passer domesticus, in Kenya expanding inland along corridors of human development (roads), the birds at the leading edges of the range expansion showed greater responsiveness of the adrenocortical responses to acute stress and enhanced exploratory behavior.
To facilitate the acquisition and analysis of the continuous recording of song development of individual birds, we have developed an open source software program that automates much of the data acquisition, feature calculation and database handling-Sound Analysis Pro.
The development of transgenic birds producing enzymes that are active against most noxious antinutrients, can help in stabilizing gastrointestinal tract microflora without using antibiotics or other feed additives.
Anyone who has skimmed a high school biology textbook will be familiar with the iconic examples of homology that seem inseparable from any explanation of the term: the limb structure of four-legged animals, the human tailbone and the more elaborate tail of monkeys, and the remarkable similarities among the embryological development of fish, birds, and humans.
This is particularly true if one's main interest is the development of bird art and the scientific illustration of bird books over the centuries.
GA III 1 carries over to them whatever is common to the two cases, with discussion of the development of birds in their eggs beginning in GA III 2. A recurring aspect of his argument, here as in PA, is to refer us for descriptive details to the histories (presumably the basis of our HA) and to a collection of representations of dissections (tragically not preserved).
Dr. DeVoogd, who has studied the development of song in birds, said the ability to imitate a species' own song was present in all songbirds.
If genetic diversity affects the development of the vocal apparatus and/or bird's body condition, song performance may be directly correlated with individual genetic diversity as a result.
