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

What are the main representatives of the pteridophytes, What are the main r...

What are the main representatives of the pteridophytes? Is this plant group cryptogamic or phanerogamic? The better known pteridophytes are the ferns and the maidenhairs, from

Role of nerves - regeneration, Role of Nerves - Regeneration It has b...

Role of Nerves - Regeneration It has been seen that soon after amputation nerves invade the regeneration blastema. If the stump is denervated by cutting the nerves supplying

Male reproductive system - urethera, URETHRA - It is common duct as ...

URETHRA - It is common duct as sperms & urine both pass from it. It receives juices of prostatic gland & cowper's gland. Urethra is 20 cm long, passes through the peni

Explain advantages of periodontal ligament, Explain periodontal ligament ...

Explain periodontal ligament The absence of the periodontal ligament and the presence of osseointegration instead of the gomphosis joint leads to the difference in movement un

What is the function of the flagellum of the sperm cell, What is the functi...

What is the function of the flagellum of the sperm cell? How is it formed? The flagellum of the sperm cell is produced by the centrioles that migrate to the region posterior to

Transcription of a eukaryotic protein-coding gene, 1. Describe how the vari...

1. Describe how the various molecular mechanisms act to regulate transcription of the genes within the lactose operon of E. coli . 2. Transcription of a eukaryotic protein-codi

How to determines the actual availability of nutrients, How to determines t...

How to determines the actual availability of nutrients The amount of a particular nutrient determined analytically does not necessarily represent what is available but is merel

Enzymes, The Biological Catalysis Enzyme: Biological catalysis  are cal...

The Biological Catalysis Enzyme: Biological catalysis  are called enzyme. An enzyme can be defined as an organic  substance that tremendously accelerates a chemical  reaction w

Proto-oncogenes, Proto-oncogenes Proto-oncogenes are common genes pre...

Proto-oncogenes Proto-oncogenes are common genes present. In all organisms and emerge to be highly conserved in the course of evolution. They have been isolated in species ra

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