
Trials of Life
S01E10: Talking to Strangers
This episode concentrates on communication. In Kenya, Attenborough accompanies a tribesman who calls to a honeyguide, which in turn answers him and leads the pair to a bees' nest. The tribesman extracts the honey, and some is left to reward the bird. African hunting dogs are shown hunting gazelles, of which the target is the individual that leaps lowest. Larks evade merlin by sending a similar message: by continuing to sing while being chased, it tells the pursuer that its prey is fit and therefore will be difficult to catch. (In 80% of cases this turns out to be true.) Vervet monkeys' cries are among the most complex. Their utterances are effectively words: a vocabulary that defines each of their predators, so an alarm call is specific to a particular threat. Some creatures transmit their presence by display, and Attenborough observes thousands of fireflies illuminating the darkness. Sounds travel further underwater, and over 200 species of fish use them to communicate. In turn, sea lions have become adept at sensing their proximity. However, the most visual aquatic animal is the squid, which uses colour change and posture to communicate. Finally, Attenborough swims with dolphins. They converse with a series of ultrasonic clicks, and each has a family call inherited from its mother: effectively a 'surname'. They also use normal sound, body posture and touch - in short, in terms of ability to communicate, they are man's closest rival.
Overview
Each of the twelve 50-minute episodes features a different aspect of the journey through life, from birth to adulthood and continuation of the species through reproduction.
Episodes


S01E02 Growing Up

S01E03 Finding Food

S01E04 Hunting and Escaping

S01E05 Finding the Way

S01E06 Home Making

S01E07 Living Together

S01E08 Fighting

S01E09 Friends and Rivals

S01E10 Talking to Strangers

S01E11 Courting

S01E12 Continuing the Line
Cast
