His knees became hard like those of a camel, in consequence of him constantly bending them in prayer.
-Eusebius of Caesarea, Early Church Historian, 4th C, referring to the Apostle James
Abu Hurairah reports the Messenger of Allah as saying, When one of you prostrates himself, he must not kneel like a camel, but rather put down his hands before his knees.
-Sunnah of Abu Dawood (9th C), Book 2:840
The drovers didn’t pray daily, certainly not five times a day, but their hands were busy whenever they did, first standing, then bending forward at the waist, then going to their knees, then dropping their forehead to the ground in a manner I’ve never seen a camel couch. I guess they believed Abu Hurairah over Eusebius, either that, or when they did their Sujūd, Prostration, they did so on their Sajjāda, Prayer Rug (in their case, a saddle blanket, and thus protected their knees).