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This species, far less known and widespread than the Three-spined, is not found in Northern Scotland. It is small, seldom reaching three inches in length. It has from 8 to 11 short spines on the back. Its colour is greenish-olive, with many dark dots; in the Spring the male is blue-brown, much less conspicuous than its red-bellied larger brother. The habits of the two species are very similar, but the nest of the Ten-spined is hung on to weeds above the river bottom, unlike that of the Three-spined. |
