Evolution is a fascinating process and can happen much quicker than we think, as evidenced by some of the species that live within the dunes and plains of this white desert.
The dunes themselves are only about 10,000 years old, forming around the same time as the Agricultural Revolution was happening. In evolutionary terms, that’s not very long, but it’s proven long enough for some animals to become paler than their non-desertic counterparts in order to survive.
As cute as they are fascinating, these species include the bleached earless lizard, the knit fox, the pallid bats and the apache pocket mouse. What’s even more fascinating about the latter is that it can go an entire lifetime without drinking water, gathering it from the seeds it eats.
The “sand” of these dunes is unique. According to Las Cruces News, instead of being composed of silica, like most inland sand, the sand at White Sands is almost pure gypsum, which is why it has the peculiar color that has forced species to adapt.
“Gypsum is actually a clear substance; the dunes appear white like snow because the gypsum grains are constantly banging into each other. The scratches then reflect the sun’s rays making them appear white…
Also, unlike silica sand, gypsum doesn’t absorb heat from the sun. So even on the hottest day of the year, the dunes are cool and comfortable to walk on.”