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National Geographic : 1977 Mar
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GIANT XESTOSPONGIA, a barrel sponge six feet tall, clings to the side of a reef off Roatan Island (left). In addition to their extraordinary powers of regeneration, sponges reproduce themselves sexually. Another barrel sponge releases a cloud of sperm (below), relying on the current to carry it to other sponges of the same species. Some sponges exhibit both male and female characteristics at the same time; others have been observed to change their sex from month to month; still others maintain constant sexual identities. 4 FEETTALLABOVEVE, GKANrULATMn 1ILRu, rnvu 401
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