Studying and managing wildlife is seldom an easy task, but wildlife management along the border presents special challenges. Observing wildlife in the U.S. may tell only half the story, since many migratory birds, bats, and insects spend their winters deep in Mexico. Remoteness, inaccessible terrain, and a sometimes unstable political climate can make it difficult for wildlife researchers to gain information on wildlife along the border or far into the interior of Mexico. Problems can also arise when different countries have differing attitudes toward the same animal; one country may protect a certain species while another may want to eradicate it. Laws may protect wildlife and their habitat on this side of the Rio Grande while leaving them unprotected on the other side of the river.