common fate: a Gestalt principle of organization holding that aspects of perceptual field that move or function in a similar manner will be perceived as a unit
gestalt law of organization: a principle of Gestalt psychology that identifies factors leading to particular forms of perceptual organization
chronoperates paradoxus: shrew-sized protomammal from the Alberta region of Canada; from about 55 million years ago (much more recent than other mammal-like reptiles)