|Wednesday, May 8, 2013 - 5:30 AM
"Quillber's Birthday Present"
It's Aviva's birthday, and Chris and Martin decide to collect shed porcupine quills to make a beautiful necklace as a gift. As they tag along with an African Crested Porcupine, they discover that animals have different ways and even some highly specialized features to defend themselves from predators. For example, porcupine quills are modified hairs, designed by nature into a deadly defense. D
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