Meat by Terry Bisson
February 18, 2015“They’re made out of meat.”
“Meat?”
“Meat. They’re made out of meat.”
“Meat?”
“There’s no doubt about it. We picked up several from different parts of the planet, took them aboard our recon vessels, and probed them all the way through. They’re completely meat.”
“That’s impossible. What about the radio signals? The messages to the stars?”
…
This is the beginning of short story i really liked, written by Sci-Fi writer Terry Bisson in 1990. You should read the full version.