Yes they do because that's how they molt.
Each other!
they hump each other
Yes baby rats can hump each other. There is nothing to worry about though. This is just called "bulling".
Violently. With their bodies.
yes, yes they can
hump each other
no the hump each other
Bugs can communicate with each other, but they can not talk to humans.
Scissoring?
In order to get babies they should.
1 like climbs on the other, half on half on the ground. and it humps.
yes usually. see "bird's and bee's"