Biology B3 Part 7

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  • Created by: Sam
  • Created on: 24-04-12 15:05

Based on Edexcel textbook

pg 62-63 Catching prey

Carnivores eat meat which is a richer source of nutrients that plant material. This means they don't have to spend as much time feeding.

Examples of adaptions to catch prey are:

  • Foxes have eyes close together on the front of their head meaning that they can judge distances well (but it does narrow the field of vision)
  • Bears have large pointed canine teeth to grip into prey and stop them escaping. Cheek teeth are adapted to slice through flesh and bone.
  • Cheetahs have a flexible spine that allows their front and back legs to overlap giving them a longer stride for speed
  • Tigers strips makes them difficult to see among tall grass so they can sneak up on prey (camoflauged)
  • Moving to where prey is plentiful e.g. a watering hole.

Some animals hunt in packs because it allows them to bring down much bigger prey so overall the animals have more than if they had tried to hunt alone there is also fewer leftovers and scavengers can more easily be chased away.

Others work as individuals because for example wild cats catch small prey leaving few leftovers to share so pack life would have little advantage.

pg 64-65 Non-verbal communication

Facial expressions are a way of telling emotions. Chimpanzees pull faces too and their expressions are usually similar to ours in appearance and meaning but emphasis is different eg. chimpanzee have a broader smile but this is because of different facial structure not depth of emotion. Some expressions do have different meanigs too such as, a broad open grin on a chimp which is thought to show fear rather than joy.

Body language is another type of non-verbal communication. This can be movement and posture. People also use gestures to communicate but they can mean…


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