Every morning since our big rain I have been fortunate enough to look out my east window and see the sun coming up over a lake in our pasture. We have several playa lakes around here. To make a long story short, they are lakes (pond might be a better term) that appear after rain and hold water for a short period of time. If we keep getting moisture, we might have them all summer. Or, we may just have them few weeks. Either way, they are fascinating as they create their own ecosystem.
Playa lakes are very important to birds--especially migratory ones. I noticed a pair of ducks on one the other day. Some people think they are important recharge areas for the Ogallala Aquifer--our underground water source (others question how much recharge they contribute because of their clay bottoms that help hold water.)
My picutres are not the best--please note in the first one, the green you see is wheat. We had to disaster it already because of our dryness during the growing season. I'll post pictures of our pasture when it greens up.