• (a.) Having or designating conspicuous or warning colors or structures indicative of special means of defense against enemies, as in the skunk.
colourings are used to scare away Predators, e.g. strong colours on frogs.Poisonous Dart Frog
a brightly colored organism that is typically poisonous.
Ap`o·se·mat'ic adjective [ Prefix apo- + sematic .] (Zoology) Having or designating conspicuous or warning colors or structures indicative of special means of defense against enemies, as in the skunk. 
Having bright, bold colors and patterns (often reds and oranges) that advertise to potential predators that an individual is bad tasting or poisonous. A few species that are perfectly palatable also have evolved these warning colors and patterns. The strategy of sporting aposematic coloration is called aposematism.
colored or constructed in a way that indicates special capabilities for defense.