You will hear a recording. Click on the paragraph that best relates to the recording.
Current Status:
Beginning in 10 seconds
Rate速率
0.40.811.52.0
1. Dolphins, whales and porpoises are all social animals, but some species are more sociable than others. This depends on the environment because a species adopts the lifestyle most suitable for this. Among dolphins, forming groups makes it easier for them to find food, reproduce and gain knowledge. They are safer, too, because dolphins can communicate danger when there are threats around. 1. Dolphins, whales and porpoises are all social animals, but some species are more sociable than others. This depends on the environment because a species adopts the lifestyle most suitable for this. Among dolphins, forming groups makes it easier for them to find food, reproduce and gain knowledge. They are safer, too, because dolphins can communicate danger when there are threats around. 2. The speaker explains that whales, dolphins, and porpoises have evolved differently and face different threats. River dolphin numbers are declining, while ocean dolphins are doing well in spite of the threats they face. The reason for this is that ocean dolphins are better adapted for finding food and avoiding predators. 3. Dolphins have adopted group living as a response to living in close contact with other animals in the ocean, some of which kill dolphins for food. Living in social groups makes it easier to hunt for food and, in a dangerous environment, it makes sense in terms of safety to move about in large numbers.
The speaker says: All whales, dolphins and
porpoises are social animals, although the degree of sociability varies greatly
from one species to another. ... we can expect the group size adopted by a
species to be the most suitable for its environment and lifestyle . . .. Some
of the reasons for living in groups include greater efficiency in searching (or
and catching food, benefits for mating, learning, defence, and sensory
integration. ... For example, if one animal discovers a shoal of fish or a
hungry shark, it can immediately pass on this information to the others in the
group so that all may benefit.
