Desert tortoises (Testudines; Testudinidae; Gopherus agassizii group) have an extensive distribution throughout the Mojave, Colorado, and Sonoran desert regions. Not surprisingly, they exhibit a tremendous amount of ecological, behavioral, morphological and genetic variation. Leer más.

During the last glaciation, a huge ice shield reached up to the region of today’s Berlin. By the time it started to melt about 20,000 years ago, it enabled a gradual re-colonization of the northern latitudes by many plant and animal species. Leer más.