Obstacles to this basic need to roam, such as human development, can provide formidable threats to long-term survival of many species. For the large carnivores, it's not just about losing the freedom to move, it's about losing a natural process.
If you're keeping score at home, of the three Marvel comic-book movies so far this summer (a term I use advisedly for a season that technically doesn't start for another month), X-Men: Days of Future Past outranks Amazing Spider-Man 2 and is about on a par with Captain America: The Winter Soldier.
In a sense the movie is trying to solve a problem -- the destabilization of American masculine identity, a destabilization that was signaled by 9/11 and the Middle East mire but is also deeply tied to the rise of the Asian economies.
I like to see big summer movies in the theater, I really do. It's my hope that the disappointing box-office receipts wake up the studios, and spur riskier ventures that attempt to keep up with what's going on in the online world.