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BiologyVery little is known of the ecology of this species but recent research, funded by English Nature, has led to a number of new observations. Like most hoverflies, adults fly only on warm sunny days (5), they have been seen feeding on the flowers of bogbean, marsh marigold and cuckooflower (7). They fly low, rarely reaching heights of over 1 metre above the ground (5). Peak times of adult abundance occur in May, mid-July and mid-September; this has led some people to believe that there are three broods each year, each with a different time of adult emergence, however the evidence is insufficient to demonstrate whether this is the case (5). Males seem to hold 'mating territories' which they defend against other hoverflies and even bumblebees and other insects by chasing them away (5). The larvae of this species have never been identified, but females have been seen ovipositing on fresh cow dung and on sphagnum moss near dung (9).