Bear
Bears occupy an extraordinary range of ecosystems, from Arctic ice sheets to temperate rainforests, from Asian bamboo groves to North American garbage bins. The species demonstrates remarkable dietary flexibility, consuming everything from salmon to berries to poorly secured camping provisions. This adaptability has enabled bears to survive multiple ice ages, continental shifts, and the development of bear-proof containers (which they continue to defeat with troubling regularity).
Shrek
Shrek's adaptability centres primarily on emotional growth rather than environmental tolerance. Over four films, he adapted from misanthropic recluse to devoted family man, demonstrating psychological flexibility rarely seen in fictional monsters. However, his physical requirements remain notably specific - requiring swamp conditions, mud baths, and a steady supply of earwax candles. His attempts to function in Far Far Away's urban environment met with limited success.
VERDICT
Shrek's character arc demonstrates admirable personal development, but the bear's ability to thrive across six continents and countless ecosystems represents adaptability on a genuinely impressive scale. Evolution defeats animation in this category.