Camouflage is the most common defence against predators in nature - but how good such a strategy is depends on two things: how well the camouflage prevents initial detection and how well it inhibits learning.
If too many animals use the same strategy then predators are likely to learn to outsmart them.
Therefore, different camouflage strategies must be used in order to keep predators fooled for longer.
Read more at University of Exeter, University of Cambridge