Chemical Identification of Bird Excrement in Egg Productsdoi:10.1093/jaoac/45.3.659Thrasher Joel JJournal of Association of Official Agricultural Chemists
A more-elaborate definition would note that they are warm-blooded vertebrates more related to reptiles than to mammals and that they have a four-chambered heart (as do mammals), forelimbs modified into wings (a trait shared with bats), a hard-shelled egg, and keen vision, the major sense...
Theories of egg formation, embryo development within the egg, and post-hatching biology of birds are compared in J.M. Starck and Robert Ricklefs, Avian Growth and Development (1997). Evolution and classification The evolutionary history of birds with emphasis on the fossil record of both birds ...
The size of the bird eggs can give you a good hint as to the size of the parents (small eggs = small birds while large eggs = larger birds.) The egg shape is another good indicator of the lifestyle of the bird you are trying to identify. Eggs that are pointed on one end may hel...
Effects of experimentally increased egg production on female body condition and laying dates in the great skua Stercorarius skua. J Avian Biol. 2004;35:501–14. Article Google Scholar Kaliński A, Markowski M, Bańbura M, Mikus W, Skwarska J, Wawrzyniak J, Glądalski M, Zieliński P, ...
2321 well selected photographs, all in HD quality (1024 x 678 Pixels) Photos to each species, including female as well as summer and winter plumage for nearly every species All images labeled Sort and display species: A-Z, 19 different languages, taxonomic ...
(if visible) and location, signs of impending or recent egg laying in adult females, and any peculiarities such as scars, odd-colored feathers, or presence of parasites. Pollen may be collected for later identification to help us understand what natural resources the birds depend on during ...
Northern species tend to nest in the spring and time their egg-laying to coincide with the greatest concentration of prey in the warmest months. The number of eggs will vary, but some species can lay a clutch of up to 12 eggs at a time. These eggs are laid a few days apart so they...
We quantified laying date (the date on which the first egg of a clutch was laid) for all females in all populations based on regular nest-box checks (at least weekly). When nests were not observed on the day the first egg was laid, laying date was estimated assuming one egg laid per...
The many threats faced by turtles in the BHS include habitat destruction of nesting beaches from coastal development, beach erosion, pollution, egg predation, poaching of adults and eggs, bycatch (Hitipeuw et al., 2007, Tapilatu and Tiwari, 2007) and saltwater inundation as a result of increa...