The current migration represents income investors migrating into the stock market out of desperation, many have essentially been forced into it.

FORBES: Connect

Alberta's battle with rodents began around 1950, when Norway rats, the most common breed, began migrating into the province in large numbers.

WSJ: In Alberta, Citizens Smell a Rat After Long-Banned Rodents Appear

An electric barrier in a shipping canal near Chicago is meant to keep them from migrating into Lake Michigan, where scientists say they eventually could spread to the other Great Lakes and out-compete native fish for food.

WSJ: Study: Asian carp unlikely to stow away in barges

Just as with the Linux operating system, which started small with certain workloads, then expanded into large deployments, migrating to the cloud is likely to be an iterative process, with several learning cycles.

FORBES: Red Hat's Formula for an Open Cloud

There was some doubt as to whether the team would be able to locate a migrating herd of pregnant females, but one week into the search, they stumbled upon 70 to 80 chiru grazing in a valley below their camp.

NPR: Chang Tang's Endangered Antelope