Reinventing the Wheel: 5 Species That Roll

If wheels and rolling have proven so efficient for humans, why hasn’t evolution pushed at least some other species in that direction? Well actually, there are a few species that can get around by rolling.
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GOLDEN WHEEL SPIDER
0:43
2 Myrmecina graminicola
3:11
MOTHER-OF-PEARL CATERPILLAR
3:28
SOUTHEASTERN BEACH TIGER BEETLE LARVA
4:47
5 RUSSIAN THISTLE
7:4