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The adults drink dew and nectar. The larvae prey on or become parasites of gastropods (slugs and snails). The occasional sciomyzid attacks snail eggs or fingernail clams. [3] Very little is known about the complete life cycle of these flies but most of the known larvae are semi-aquatic and some are aquatic. Other species have terrestrial larvae.
The adults of Coremacera marginata grow up to 7–10 millimetres (0.28–0.39 in) long. These flies have a slender, dark greyish body. The prominent eyes are reddish. The brown-yellowish antennae are forward-pointing, with a hairy 3rd segment and a whitish arista. The dark grey wings are mottled with greyish spots.
Wings may have evolved from appendages on the sides of existing limbs, which already had nerves, joints, and muscles used for other purposes. These may initially have been used for sailing on water, or to slow the rate of descent when gliding. Two insect groups, the dragonflies and the mayflies, have flight muscles attached directly to the ...
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The fish find these new adults easy pickings, and fishing flies resembling them can be successful for anglers at the right time of year. [18] The adult stage of a caddisfly may only survive for a few weeks; many species do not feed as adults and die soon after breeding, but some species are known to feed on nectar. [19]
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Some viral videos involved more than one animal, like one the USA TODAY Network obtained in June showing a fearless bear fighting off two alligators in a Florida river.