A silicon-based space monster code-named Rock Fly.
Video:
http://www.okim.nickersonm.com/SF/rockfly.avi (~60mb)
Rock Fly was first encountered by XLE mining fleet in a distand asteroid field. Fly was at first peaceful and seemed to be quite curious of the shiny XLE ships. Several hours later after examining the fleet the Fly left them much to the relief of the crew.
Only when mining fleet proceeded with its main goal the Fly returned and attacked them. Fortunatelly a near by strike fleet answered the emergency call and managed to arrive before miners were obliterated. As scientists uncovered later - the asteroids that miners began to harvest contained 'hives' of small buggers - probably that`s why the Fly attacked.
Rock Flies are silicon based. They manage somehow to convert large amount of minerals into energy. Its 6 legs each contain a weapon that can act on its own. The Fly can spit out unstable bolt of superheated plasma that seems to detonate as soon as it gets into proximity range of the target. Rearlimbs include a powerful melter beam that is probably used to melt the ore that the Fly later consumes. Forelimbs launch a spray of small spikes. Scientists have no idea how the Fly is using those.
The main 'weapon' of each Rock Fly is its spawn - a swarm of tiny flies that are believed to be Fly`s children rather than workers. Each small bugger has a tiny shard thrower that is quite useless against armour and shields, but is dangerous to fighters.
The Rock Flies live a very long life that is believed to last millenias. They seem to be peaceful if not directly threatened.
Now the technical stuff. Wings are decorative and transparent. They are moving like sensor dishes, but each combat they randomly pick the direction. Weapons have offsets to the sides to make them look more organical. They are, however, quite good at hitting things. Plasma breath is a modified plasma blast cannon - better ROF, lower damage. The whole head is a plasma turret with animated mandibles.
Engines are placed in the wings` roots. There are two drives that will generate some greenish particles when The Fly moves.