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

Endocrine glands, Endocrine glands Endocrine glands have no ducts - ...

Endocrine glands Endocrine glands have no ducts - so these are also called as ductless glands Eg.Pituitary etc., These glands secrete chemical substances called HORMONES

Fibre requirements for ulcerative colitis, Q. Fibre requirements for ulcera...

Q. Fibre requirements for ulcerative colitis? Fibre: Eliminating roughage seems to have a better effect on preventing relapses of the disease. A low residue diet may be given d

State the uni-ocular movements, State the Uni-ocular Movements In each...

State the Uni-ocular Movements In each eye, for every movement there is an agonist, antagonist, and a synergist. An agonist is the main muscle that is active in carrying out t

.rRNA , rRNA structure and synthesis assignment

rRNA structure and synthesis assignment

Define obligatory nitrogen losses, Define Obligatory Nitrogen losses? T...

Define Obligatory Nitrogen losses? The Committee estimated the total obligatory nitrogen losses through faeces, urine, skin and other miscellaneous routes in adult men as 2.0 m

What is peaked t-waves, Q. What is Peaked T-Waves? Exercise induced inc...

Q. What is Peaked T-Waves? Exercise induced increase in T-wave amplitude in V2 is quite predictive of anterior wall ischaemia (specificity = 95 percent). It appears that this m

Explain the control of air pollution, Explain the Control of Air Pollution ...

Explain the Control of Air Pollution a. Air belongs to everyone Need it to treat air pollution as public problem   b. Air pollution is an inevitable concomitan

What is the constitution of the cartilaginous matrix, Q. What is the consti...

Q. What is the constitution of the cartilaginous matrix? The cartilaginous matrix is made of generally collagen type II, collagen fibers, and of proteoglycans, proteins associa

Benefits of haccp, The benefits of HACCP  can be  summarized  as under. ...

The benefits of HACCP  can be  summarized  as under. a)  Benefits to Consumers Reduced risk of food borne diseases Increased confidence in food supply Increased awar

How is excretion done in amphibians, Q. How is excretion done in amphibians...

Q. How is excretion done in amphibians? Adult amphibians have kidneys that filter blood. Nitrogen waste is excreted as urea so amphibians are ureotelic beings. The aquatic, lar

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