Bath sponges – Marine animals without backbones – Te Ara Encyclopedia of New Zealand

The natural sponges we use in our baths are actually animal skeletons. Bath sponges consist of a highly porous network of fibres made from a collagen protein called spongin. The skeletons are obtained by cutting the growing sponges and soaking the cut portions in water until the flesh rots away.

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Marine animals without backbones – Te Ara Encyclopedia of New Zealand

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Bath sponges – Marine animals without backbones – Te Ara

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Marine animals without backbones – Te Ara Encyclopedia of New Zealand