Heterochrony
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In evolutionary developmental biology, heterochrony is any genetically controlled difference in the timing, rate, or duration of a developmental process in an organism compared to its ancestors or oth
Giraffes acquired their long necks through heterochrony, extending the development period of the seven neck vertebrae's growth in the embryo to add length to the bones, not by adding more bones.
Axolotls retain gills and fins as adults; these are juvenile features in most amphibians.
Irish elk skeleton with antlers spanning 2.7 metres (8.9 ft) and a mass of 40 kg (88 lb)
Foster's rule
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Foster's rule, also known as the island rule or the island effect, is an ecogeographical rule in evolutionary biology stating that members of a species get smaller or bigger depending on the resources
Heterochrony
…accommodate the abundance of food and resources they have on their islands. These factors are part of a complex phenomenon termed Island syndrome or Foster's rule. The mole salamander, a close relative to the axolotl, displays both paedomorphosis and peramorphosis. The larva can develop in either direction…
Garganornis ballmanni, a very large fossil goose from the Gargano and Scontrone islands of the Late Miocene