Look at this image of butterflies. What are their similarities and differences in appearance?

Source: Butterfly Collage, Science Daily

Just as with the butterfly population pictured above, in every population there is variation of traits. In other words, not all the organisms in a population are exactly the same. These differences in traits are caused by genetic mutations. An adaptation is a trait which helps an organism or species survive. Adaptations can be structural or behavioral. Camouflage is an adaptation you are probably very familiar with. Watch this video and see some amazing examples of camouflage.