A creature or fossil that displays a mixture of characteristics usually associated with different life forms, but may not be chronologically intermediate between them. For example a platypus has a duck-like bill and lays eggs like a bird, and has fur like a mammal, but is a currently living creature and thus cannot be a mammal-to-bird (or bird-to-mammal!) transition. Likewise, Archaeopteryx has a mix of features like claws and teeth, and feathers, but appears well above other fully formed birds in the fossil record. Thus it is not a transition. Mosaics typically have a mix of features that are individually fully developed, not in a crude state (for example, primitive feathers).