What does it mean, when two pigeons stand in front of each other, slightly touching their chests?

Methinks you are obsessed with alien and/or anal probes, loli.

“Are they alien probes,”
No. Well, apparently they’re dinosaur descendants. That’s pretty alien.

“communicating with one another via touch?”
Yes. And they like each other.

Maybe they scored a TD
https://giphy.com/gifs/nfl-football-26u4nNsQBFTiXuz72

Both had journalists killed?

Every city on Earth between the equator and the poles is invaded by an estimated total of 30 billion pigeons and you wonder why two of them are standing in front of each other?

Lesbian pigeons?...

Trying to fuck? But don’t know how?
Probably teenage pigeons.

I led the pigeons to the flag of the United States of America.