Birds don't need mobile phones or the Internet to communicate. Here's why.
The Birdwatchers' Society of Andhra Pradesh (BSAP), in collaboration with Goethe-Zentrum Hyderabad, is presenting, on a monthly basis, The Life Of Birds - a BBC series of 10 documentary screenings exploring the life of birds.
This month, the 18th of November, the topic is "Signals And Sounds", and this will be screened from 6pm at the Goethe-Zentrum office premises. In the documentary, David Attenborough, a naturalist, hosts an exploration into the secret lives of birds.
6th in the series, Signals And Sounds 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 cooperate to warn one other of approaching danger. A sunbittern is shown expanding its plumage to discourage a group of marauding hawks. The members of the finch family show how colour helps in recognition.
Birds have a high degree of 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.
Saddlebacks vary their calls so that even individuals from different areas can be identified. Then, there is much to learn about why so many different birds sing together at the same time of day.
Finally, Attenborough introduces the Superb Lyrebird as one of the most versatile of performers - it is a skilled mimic, and imitates not only other species, but also cameras, a car alarm and a chainsaw.
Entry to the screening is free for everyone. Please contact Shafaat Ulla at 98492-29552 or Shanti Mani at 93910-08302 or Goethe-Zentrum at 6552-6443 for further details.