They have been among us for years, although some of their face masks are visibly cracking:

/old not the nine o'clock news gag
From the
Aliens on Earth challenge. See all
411 entries (closed)
(
brianftang www.twitter.com/brianftang, Mon 9 Oct 2006, 21:36,
archived)
Ewww
That's almost as bad to look at as latticeworked fat blisters on bacon.
/shudders
(
Black Moon Fuck You- I won't do what you tell me!, Mon 9 Oct 2006, 21:39,
archived)
ahhhahah!
well done.
and DO NOT BUY DURACELL BATTERIES.
(
Rapitinui comes in a wrapper of cellophane, Mon 9 Oct 2006, 21:46,
archived)
They may last five times longer, but they cost SEVEN times as much!
..that's the punchline to the alien sketch referenced above, from the live double album.
(
Rapitinui comes in a wrapper of cellophane, Mon 9 Oct 2006, 21:59,
archived)