The Life Of Birds: Signals and Songs

Free Documentaries Online

Free Documentaries Online

Find us on:
  

Who's Online

We have 260 guests and 9 members online


The Life Of Birds: Signals and Songs
Close Ad
Lights off
Rate:
0 ratings
Views: 552

From: silichip
Videos: 1981
Added: 08-09-2012 17:29:05
Broadcast 25 November 1998, this installment describes ways of communicating. A colony of fieldfares in Sweden deters a raven from raiding a nest by collectively raising an audible alarm. However, in an English wood, all species co-operate to warn each other surreptitiously of approaching danger. By contrast, a sunbittern is shown expanding its plumage to discourage a group of marauding hawks. The members of the finch family exemplify how colour aids recognition. Birds have excellent colour vision, and the feathers of many species react to ultraviolet light. Flocking birds, such as sparrows, also have a 'ranking system' that determines seniority. In Patagonia, Attenborough demonstrates the effectiveness of sound: he summons a Magellanic woodpecker by knocking on a tree. The nature of tropical rainforests means that their occupants tend to make much louder calls than those in other habitats, and several such species are shown. Saddlebacks vary their calls so that even individuals from different areas can be identified. The dawn chorus provides a mystery, as there is still much to learn about why so many different birds sing together at the same time of day. (Proclaiming territory or attracting mates are two likely reasons.) Finally, Attenborough introduces the Superb Lyrebird as one of the most versatile performers: it is a skilled mimic, and this particular one imitates not only other species, but also cameras, a car alarm and a chain saw.
Url:
Embed:

Related Videos
0:49:18
Owner: silichip
Views: 481
Date: 08-09-2012
0:49:18
Owner: silichip
Views: 522
Date: 08-09-2012
0:49:18
Owner: silichip
Views: 602
Date: 08-09-2012
0:49:11
Owner: silichip
Views: 578
Date: 08-09-2012
0:49:16
Owner: silichip
Views: 695
Date: 08-09-2012
0:49:17
Owner: silichip
Views: 535
Date: 08-09-2012
0:49:17
Owner: silichip
Views: 613
Date: 08-09-2012
0:49:18
Owner: silichip
Views: 745
Date: 08-09-2012
Owner: silichip
Views: 824
Date: 06-12-2010
Owner: silichip
Views: 2392
Date: 06-12-2010
Owner: silichip
Views: 1009
Date: 06-12-2010
0:53:28
Owner: silichip
Views: 1037
Date: 06-12-2010
Owner: silichip
Views: 1055
Date: 06-12-2010
Owner: silichip
Views: 959
Date: 06-12-2010
Owner: silichip
Views: 942
Date: 06-12-2010
Owner: silichip
Views: 805
Date: 06-12-2010
Owner: silichip
Views: 912
Date: 06-12-2010
Owner: silichip
Views: 1031
Date: 06-12-2010
Owner: silichip
Views: 923
Date: 06-12-2010
Owner: silichip
Views: 959
Date: 06-12-2010

 
Joomla Tutorial at JoomlaShack.com
Watch Free Movies