http://en.wiktionary.org/wiki/nestmate Either your version of 'nestmate' is a misnomer, or you avians are into incest or something.
"One with which a nest is shared" - two lovers can share a nest. Eh, whatever. Everyone in the server calls it that way right now anyway.
"a baby bird and its siblings or figuratively a child with children it is raised with" Face it. You're a bunch of Zoroastrians. There is no escape. BACK TO PICS IM SORRY
"Such as a baby bird and its siblings" - that is providing examples. The definition is "one with which a nest is shared". If you think about how avians couples share beds and wouldn't sleep with their own children because of squick factor then the word usage is still accurate. In real life it is used to refer to the hatchlings because naturally they are all in the same nest upon hatching until they are ready to fly. So, nah. BACK TO PICS GAIS.
True. Don't let yourself get put in a position where you are up against invincible people or people who argue their way out of consequences.
"I don't appreciate you referring to me as a cis-gender human male. I'm a trigender pyrofox." How I imaging you all are IRL.