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Very bright colours, such as yellow, red and orange, [is used|are used|are using|used to] to warn and to attract. Birds, reptiles, fish and insects use brilliant combinations of colours [to attract|attract|attracting|to attracting] mates. Butterflies are an excellent example too. Birds have the best vision in the natural world and, therefore, also come in beautiful colours and patterns.

[None|Some|Any|No] predators use bright colours to attract their prey. Take, for instance, the spiny spider in Australia. When a researcher [died|dyed|was dyed|dyeing] the yellow back of a spiny spider black, he noticed that it caught less prey than with its natural colour. Some animals also use bright colours to warn potential predators that they are nasty and poisonous. Others just imitate the warning patterns of dangerous animals to fool predators and protect [himself|themself|themselves|them].