Flightless birds, Biology

Assignment Help:
#Most of the world''s flightless birds are either nocturnal and secretive (e.g. the kagu) or large, swift and well-armed (the ostrich). The exceptions are found primarily on islands, and many of these island species have become extinct with the arrival of humans and their domestic animals.

What special biogeographical conditions on islands might permit the survival of flightless birds? Why has the colonization so often resulted in the extinction of such birds? The power of flight has been lost secondarily in representatives of many groups of birds; what are some possible evolutionary advantages of flightlessness that might offset its obvious disadvantages?

Related Discussions:- Flightless birds

Simple or unilayered epithelia, SIMPL E EPITHELIA (UNILAYERED EPITHELIA) -...

SIMPL E EPITHELIA (UNILAYERED EPITHELIA) - 1 .      SIMPLE SQUAMOUS EPITHELIUM (PAVEMENT EPITHELIUM) - It is composed of large flat cells whose edges fit closely toge

excreation, ARE BONY FISHES AMMONOTELIC?

ARE BONY FISHES AMMONOTELIC?!

Determine the term - angiomas, Determine the term - Angiomas Angiomas a...

Determine the term - Angiomas Angiomas are congenital collections of abnormal vessels that divert the normal flow of blood. These capillaries, venous, or arteriovenous (A-V) ma

Briefly explain about the flexed-arm hang test, Briefly explain about the F...

Briefly explain about the Flexed-arm Hang Test? Persons who cannot do one pull-up may do the flexed-arm hang. Using the same hand position as in pull-ups, subject takes flexed-

Pollinia and massulae, Pollinia and Massulae In most cases the pollen ...

Pollinia and Massulae In most cases the pollen grains of each tetrad become separated from one another and they lie freely in the pollen sac. In some plants, mostly members of

The probability of an individual in the trihybrid, The probability of an in...

The probability of an individual in a trihybrid F2 generation showing the dominant phenotype for just two traits?

Determine guidelines to lower risk and wise use of drugs, Determine Guideli...

Determine Guidelines to Lower Risk and Wise Use of Drugs? There can be no two views regarding the act that the management of many diseases require drug therapy. However, they m

What are biopolymers, Q. What are biopolymers? Ans. Polymers are m...

Q. What are biopolymers? Ans. Polymers are macromolecules made by the union of several smaller identical molecules, called monomers. Biopolymers are polymers present in th

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd