If most animals are colour-blind, why are so many animals brightly coloured?

Question: If most animals are colour-blind, why are so many animals brightly coloured?
- Keywords:
  animal,
  brightly,
  colour-blind,
  coloured,
  eyesight,
  sense,
  sight
Asked by finlay to Cathal, Daphne, Darren, Jon, Katherine on 15 Mar 2012.
- Katherine Haxton answered on 15 Mar 2012:
  
  Sometimes its not the colour but the pattern the animals have. Many animals, birds and insects have markings that look like eyes to scare of predators. Also animal markings are camouflage – they have to be the same bright colours as the world around them to blend in.

Question: If most animals are colour-blind, why are so many animals brightly coloured?