In the last 40 years, Arctic temperatures have risen at over double the pace as for the whole planet. As a result, numerous species of whales, walruses, fish, bears and seals are beginning to migrate into new habitats. In these new habitats, they encounter similar species that have not co-existed for thousands of years and interbreeding occurs, reports Nautilus.
Hybrids that mate with each other form a hybrid swarm. So, the original species disappear. Basically you've swapped out the genome that has been fine-tuned by evolution for thousands of generations," said Andrew Whiteley, an evolutionary biologist at the University of Massachusetts, Amherst. (12/13/14 Design & Trend)