Because there was nothing else to do? Searching for water? Because it was told to.
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One of the things I find so fascinating about so many of these photos from Bahrain are the horizon lines in most of the shots. If you live somewhere with ongoing expanses of flat land with no hills in site this will not seem foreign to you. But for me, seeing an obvious horizon line where the sky meets the ground is very unusual. I'd have to drive to the deserts of the Southwest or perhaps head to someplace like Kansas to see a horizon like this.
This is not the first post I've done featuring camels. Click here to read about camels in California in 1863.