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BiologyRelatively little is known of this damselfly's biology, but much can be inferred from what is known of other Calopteryx species. Larvae of this group generally live amongst the mud, roots, aquatic vegetation and litter debris in streams and rivers, and in hot countries spend one winter here before emergence as an adult damselfly (6). The adult flight period for the glittering demoiselle runs from May to August, and adults must initially undergo a pre-reproductive phase known as the maturation period, which probably lasts about 15 days (2) (6). This is when individuals normally develop their full adult colour (6) (7) Once mature, Calopteryx males generally hold territories around suitable egg-laying sites, which they defend from other males, and actively court females that fly into their territory with elaborate displays. However, at high density, territorial behaviour disappears. As with other Calopteryx species, female glittering demoiselles oviposit in floating vegetation under the supervision of their mate (6).