Two extinct hominins, Australopithecus afarensis and Australopithecus africanus, were significantly more dimorphic than chimpanzees and modern humans;...
A small mixodectid mammal called Mixodectes pungens had skeletal features adapted to living in trees, largely dined on leaves, and weighed about 1.3 kg,...
Recent discoveries of two diminutive hominin species, Homo floresiensis and Homo luzonensis, raise questions regarding how extreme body size reduction...
Bergmann’s rule is a scientific principle stating that animals in high-latitude, cooler climates tend to be larger than close relatives living in warmer...
The fastest animals are neither large elephants nor tiny ants, but intermediately sized, like cheetahs (Acinonyx jubatus). Why does running speed break...
The megatooth shark, Otodus megalodon, which likely reached at least 15 m in total length, is an iconic extinct shark represented primarily by its gigantic...
To be able to fly soon after hatching from the egg, a bird or pterosaur must have well-developed wings. Studies of small-bodies pterosaur species from...
After the extinction of non-avian dinosaurs at the end of the Cretaceous period, many mammals underwent a rapid increase in size. Several hypotheses for...
