World of Knowledge (Australia) - - Nature -

Rib­bit­ing four times a sec­ond for hours on end is tir­ing. Es­pe­cially when you con­sider that tree frogs reach vol­umes of more than 80 deci­bels, which is louder than a chain­saw. It’s be­cause their lar­ynx mea­sures al­most a cen­time­tre – or a fifth of the frog’s to­tal length.

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