I would reckon taming one of these as your first animal. For me, (Don't know about you though) the game throws a sandstorm in a short while after starting Ark: Scorched Earth, and these guys detect weather effects. Here is a link for all the signals (Not my channel, I don't have one) https://m.youtube.com/watch?v=fxWFympIoiM
DO NOT believe that this reduces weight on its inventory. As of today AUG 2020 I tested stacks of meats and berries etc, IT DOESNT. But instead it increases spoil timer of foods, meats and berries on its inventory. ⬆️ to prevent ppl from false informations!
Weight: Jerboa's total weight is HALVED on your shoulder. Ex. Let's say your crystal is 80 weight. If you have jerboa hold the crystal and put him on your shoulder it would weigh 40. Check top utility comment for his weather prediction!