Many animals have evolved to tolerate extreme environments, including being able to survive crushing pressures of ocean trenches, unforgiving heat of deserts, and limited oxygen high in the mountains. These animals are often highly specialized to live in these specific environments, limiting them from moving to new locations.
Click here for original story, A cold-specialized icefish species underwent major genetic changes as it migrated to temperate waters, new study finds
Source: Phys.org