sharp spines »
David Attenborough shows how the teddy bear chola cactus works
The teddy bear chola cactus propagates by getting stuck on passing animals using its sharp spines. David Attenborough came across one and demonstrated how it works
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Coyote Peterson Gets Quilled By A Porcupine
Porcupines are rodents, but their sharp spines set them apart from other mammals. Coyote Peterson gets intentionally quilled by the North American variant to see how much it hurts
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