According to their predators, some butterflies taste better than others. Hence, a butterfly that tastes good is generally consumed by animals, or predators, like snakes, birds and lizards. However, kinds of butterflies that taste bad will be shunned by predators due to the fact that they taste unpleasant.
There is a reason why some butterflies taste bad, however. This is because the butterflies that are known to be less desirable to predators are also know to exude a number of toxins that are able to sicken the predators. Ironically, the butterflies that taste bad are actually the butterflies which are more attractive and more brightly coloured. It seems, however, that bright colours in animals have become a sign for predators to steer clear, because of a taste or a poison that could harm them.
This has been learned over generations, when animals have eaten the brightly coloured butterflies, only to realise that the taste is awful and the substances are potentially harmful to the predator’s health.
Butterflies are not predators themselves, and are at the bottom of the food chain. They are often easy targets for predators, as long as they can be quick enough to catch them before they fly away. They’re also incredibly fascinating creatures, given that they actually start life as a caterpillar. They actually change over a period of time from one creature, to another, through a transformation in its cocoon. For more information about butterflies, simply Google search them or go on Wikipedia. There is a great deal of information that is easily accessible.