Tuesday, June 9, 2015

NOVA: The evolution of Communication

Communication between prey and predator? Preys can communicate poison by their skin color, like the Dart frog for example. Therefore predators will tend to stay away from them.


Ants communicate via hydrocarbons and create odours for communication via such hydrocarbons. Each ant job have a different odour. Scientists have been able to create particular responses in ant colonies by using dummy ants with various ant job odours.


The “Milky sea” phenomenon is created by bioluminescent bacteria who use chemicals to communicate with each other. Bacteria communicate to accomplish tasks that they would be unable to perform together: such as attacking a organism together or find food. These bacteria were lighting up to get fish to be eaten as they want to get into the stomach environments of fishes.

California ground squirrels use scent to mark territory. But these same scents leave behind olfactory cues that rattlesnakes use to hunt them Squirrels countered by chewing on shed rattlesnake skin and cloaked their scent by secreting it onto their own fur.

Scientists are now tracking whale communication via audio-detection buoy marker and satellites. Whale herds move over great distances in unison via very loud low frequency communication.

Wolf howls serve as communication of distance, location and as a form of defence (to indicate to enemies about the threatening size of their pack).

Song birds possess the most advanced vocal abilities. They can produce left and right frequencies. Sound penetrates their environment in 3 dimensions unlike visual communication which are easily blocked out by trees and foliage.

Chimps use body postures, hand signals, facial expressions and sounds to communicate. The similar areas in human and chimp brains light up when they communicate.

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