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Altricial birds are less able to contribute nutrients in the pre-natal stage; their eggs are smaller and their young are still in need of much attention and protection from predators. This may be related to r/K selection; however, this association fails in some cases. [18] In birds, altricial young usually grow faster than precocial young.
Some species, including woodpeckers, have two egg teeth; one on both the upper and lower bill. [4] After time the egg tooth falls off or is absorbed into the growing chick's bill. [5] Some precocial species such as the kiwi, and superprecocial species including megapodes, do not require an egg tooth to assist them in hatching. They are strong ...
Motmots often move their tails back and forth in a wag-display that commonly draws attention to an otherwise hidden bird. Research indicates that motmots perform the wag-display when they detect predators (based on studies on turquoise-browed motmot ) and that the display is likely to communicate that the motmot is aware of the predator and is ...
Female birds are able to produce more of a certain gender of birds that are more likely to survive under extreme conditions. In birds, the females' egg determines the gender of the offspring, not the male's sperm. In zebra finches, a study showed the effect of food on gender ratio production. For females, egg production is a metabolically ...
The Life of Birds is a BBC nature documentary series written and presented by David Attenborough, first transmitted in the United Kingdom from 21 October 1998.. A study of the evolution and habits of birds, it was the third of Attenborough's specialised surveys following his major trilogy that began with Life on Earth.
Doctors are urging all parents to hold on to their kid's baby teeth after the tooth fairy comes to visit -- and not for sentimental reasons. According to a recent study, baby teeth contain an ...
The contents of a bird's pellet depend on its diet, but can include the exoskeletons of insects, indigestible plant matter, bones, fur, feathers, bills, claws, and teeth. In falconry, the pellet is called a casting. The passing of pellets allows a bird to remove indigestible material from its proventriculus, or glandular stomach.
“I didn’t think it was a possibility," said Katy Golden, who had her tonsils taken out when she was 5 years old