Evolution by phenotype

thumb|upright=1.5 |The bright colours of this granular poison frog signal a warning to [[predators of its toxicity.]] thumb|upright=1.5 |The honey badger's [[reverse countershading makes it conspicuous, honestly signalling its ability to defend itself through its aggressive temperament and its sharp teeth and claws.]]

set of morphological features common to members of a clade of animals

origins and diversification of the organs of sight through geologic time

tendency for maximum complexity to increase over time, though without any overall direction

control of growth and differentiation by deeply conserved genetic mechanisms

origin and diversification of snake venom through geologic time

loss and regain of colour vision during the evolution of primates

evolutionary event in which bones in the jaw of reptiles were co-opted to form part of the hearing apparatus in mammals

origin and variation of colour vision across various lineages through geologic time

evolution of birds from non-flying ancestors

origin of three known varieties of flagella