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

Define risk of stress fracture among athletes, Define risk of stress fractu...

Define risk of stress fracture among Athletes? There is an increased risk of stress fracture among athletes which is associated with lower calcium intake and lower bone density

State the term - localisation scales, State the term - localisation scales ...

State the term - localisation scales The localisation scales are also empirically derived, being based on studies of patients with localised brain lesions. There are frontal,

Serendipidity, SERENDIPIDIT Y - Sometimes discoveries are made unexpec...

SERENDIPIDIT Y - Sometimes discoveries are made unexpectedly matter of chance. This is serendipidity. Examples - 1.       Structural formula of benzene - It was dreamt by

Why ingestion of vegetable fibers improve the bowel habit, Q. Why does the ...

Q. Why does the ingestion of vegetable fibers improve the bowel habit in people that suffer from hard stools? Some kinds of plant fibers aren't absorbed by the intestine but pl

Cell cycle, The cell cycle undergoes a sequence of changes which invol...

The cell cycle undergoes a sequence of changes which involve a period of growth replication of DNA, Followed by cell division. This sequence of changes is called cell cycle.

Explain glycogenolysis, Glycogenolysis Unlike glycogenesis, glycogenoly...

Glycogenolysis Unlike glycogenesis, glycogenolysis is the  breakdown of glycogen. Glycogen is  broken down  in  the  liver and muscle catalysed  by  the  enzyme glycogen phosph

How many asymmetric carbons ribose has, How many asymmetric carbons are the...

How many asymmetric carbons are there in ribose and glucose?

Chordal sparing operation- mitral valve replacement, Chordal Sparing ...

Chordal Sparing Operation : For sparing both leaflets, an incision is made on the anterior leaflet close to the annulus and then extended centrally and the two segments,

Define estimation of nitrogen and protein content, Estimation of Nitrogen a...

Estimation of Nitrogen and Protein Content Using Micro Kjeldahl's Method? Standardization of H 2 SO 4 Prepare a solution of 0.1 N H 2 SO 4  by diluting 2.8 ml of the con

Symmetry, How we explain intenal organs when we talk about symmetry??Is the...

How we explain intenal organs when we talk about symmetry??Is there any animal that is completely symmetric even insid the body?

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