Alien (Attack the Block)

These are an unnamed extraterrestrial species which crash landed on Earth through meteorite-esque cocoons.

Biology
These aliens are quadrupedal, having long legs (all four legs are the same length), armed with bear-like claws, rows upon rows of sharp fangs, having no eyes, nostrils, or ears to speak of, and communicate through sonar, shrieks, screams, snarls, and growls. They are also a sexually dimorphic species, the females being dog-sized and almost completely hairless, while the males being gorilla-sized and having a very thick coat of hair, so black in color it doesn't reflect any light at all. The males are also seen to have bioluminescent "glowing" fangs - which were initially mistaken for eyes.

It is theorized in the film, that these aliens are invaders floating through space on solar winds, looking for a planet to "infest", and when they the female finds a planet which is suitable, she excretes a musk-like fluid so the males are able to track her and then reproduce after landing on the planet, populating their new home. The fluid itself can be seen with ultraviolet light, although the males will relentlessly track anything with the fluid on it - including other living creatures.

History
One female of the species crash-landed in London, England during Bonfire Night - smashing a parked car near where a woman was getting mugged by a street gang of teenagers. While the woman escaped, the youths - led by 15 year old Moses - investigate the wreckage of the car; the female aggressively scratching Moses across his face before trying to escape. Angered, the boys corner the female with one of the gang - Pest - disorientating/injuring her with fireworks before the gang beat the female to death.

Taking her body as a trophy of sorts and hoping to make money from it, the teens head back to their home at a tower block called Wyndham Tower, where they convince a cannabis dealer called Ron and his boss Hi-Hatz to store the female's body in their fortified weed room at the top of the block. Unfortunately for all involved, the female has secreted a fluid on several people who have come into contact with her - including Moses and Hi-Hatz - with the alien males beginning to rain down on London.

Appearances

 * Attack the Block (2011)