I'm quite new to all this, I got them back in october. They're male and female and they adore each other and so... lately I've seen cosmo (male) humping blue quite a lot so I think they may be trying to mate? To go along with this, they also now spend so much more time in their nest box (I don't ever open it so that they view it as a safe space) even during the day! Their nest box has an entrance from inside their cage so they can only get in through their cage, but I keep it open so they can come out anytime to the rest of the house. Or sometimes, cosmo will go in and stay in the nest for a while and blue stays outside of the cage. I haven't seen blue go and be in the nest by herself yet, only cosmo does this. Either that or they're in together at the same time. Lately they have been spending more and more time in the nest box. Now it's not just one hour or two at a time, they'll stay there even most of the day and I hear all kinds of singing from cosmo in there.
Anytime I get close to the cage and call for them, only cosmo comes out to receive the food that I come to offer and then he will retreat back into the nest box where blue is. Thing is, my mom said she checked the nest box a few days ago (they do occassionally venture out to our nearby plants but rarely) and she saw no eggs. What does this mean? Are they preparing to have babies or something of that nature? Thank you, all sort of experience helps:)