Red-bodied appearing swollen towards tip of abdomen.
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When it comes to our two commonest red-bodied darters, the legs are the key indicator. Common Darters have light streaks (usually described as yellow) running down them. The Ruddy Darter has legs which are clearly all black, no such streak.
Lat/Lng: 52.245, -0.266
OS grid ref: TL184621