The development of marsupials
The only order in the subclass Metatheria is the Marsupial order. It has experienced great development since it originated from the ancestors of ancient mammals in the Cretaceous period. It is widely distributed around the world and competes with each other in a more or less equal position wi...
Arctic wolf living habits
Among the arctic carnivores, wolves are not much larger than foxes and are related to each other, but their prey targets are very different. Although wolves will not let go of small animals such as lemmings and voles that are brought to their mouths, they will always pick them up and eat them...