QUIVER TREE This striking giant aloe was given its name by the San people of southern Africa, who use the tree's hollow branches as quivers for their arrows. Scientists have discovered that quiver trees are starting to die off in parts of their traditional range. The species might be in the early stages of moving southward, trying to escape rising temperatures closer to the equator.
PINON MOUSE This tiny resident of the southwestern U.S. has long eked out its living in juniper woodlands, but in California it is heading for higher, cooler altitudes in the High Sierra conifer forests. The mouse...