An event of geographical isolation occurred on the islands near North Vailma Ocean in the Long-Tailed Weasel (Mustela frenata) about 5 million years ago. This occurred due to the tectonic plates moving on planet Arda once the climate started warming up.
This event of speciation happened when the islands broke off from the near by large continent creating a geographical barrier between the long -tailed weasels (Mustela frenata ). The weasels adapted differently due to their location and speciation occurred creating the Least Weasel (Mustela nivalis) and the Mediterranean Weasel (Mustela n. numidica).
The Mediterranean Weasel was not able to survive because the climate on the island was too much of a dramatic climate change for the weasels. The climate changed from being temperate with distinct seasons to being a tropical climate which they could not survive in because of their fur coats. Weasels are territorial creatures and due to the limited space the weasels fought over the little territory essentially killing their species out. Their diet also changed on the island and their usual prey, rabbits and mice, were not available, they were not adapted to hunt any other kind of creature with limited their food supply and caused their extinction.
The Least Weasel was able to survive due to its climate not changing greatly. Their food supply was still intact and they had a large span of territory to claim. Their slender bodies helped them hide and capture prey, and their elongated skulls also helped with this. Their claws were suited to grasp and kill prey and their prey also built the dens the weasels lived in. Their small size helped the weasels hide from predators and their fur protected them for the cold climate they live in.
The Least Weasel was able to survive due to its climate not changing greatly. Their food supply was still intact and they had a large span of territory to claim. Their slender bodies helped them hide and capture prey, and their elongated skulls also helped with this. Their claws were suited to grasp and kill prey and their prey also built the dens the weasels lived in. Their small size helped the weasels hide from predators and their fur protected them for the cold climate they live in.