While on guard duty up on the border a couple of days ago, we got to see some amazing weather and the first spring migrating birds of the year. During the night we were awed by almost continuous lightning, and brief but intense hailstorms. The hailstones ranged from rain drop sized to a half inch in diameter. After sunrise, while patrolling the fence, I saw several great grey shrikes of the pallidirostris subspecies (with the pale beak, whitish lores and lots of white in the wings), some desert wheatears, a stonechat, and a few barn swallows.
While watching the gerbils, I wondered if perhaps one reason why they keep enlarging their burrows is so they don't get drowned by rainstorms. The sand that the gerbils were ejecting from the burrow entrances was wet at first, and then dry. It would make sense that when it rains really hard small burrows get flooded much more easily than large ones, and when they start to flood the gerbils can keep throwing out wet sand. Also, the sand here tends to turn into a hard, almost waterproof crust over time. If the gerbils keep digging, they'd keep fresh, water-absorbant sand exposed at all times.
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