I have a male BP around 2 1/2 years old. Usually he gets out and about fine around his cage, but sometimes he gets lazy and will stay under his shelter and won't move much unless I take him out. A few weeks ago he stopped moving around much, but he moves fine when I'm holding him, so I figured he is fine.
Yesterday I got him out and put him around my neck to clean his cage. It was also his feeding day, I hadn't been able to spray his cage much in the past two days because I've been sick with strep throat and was staying over at my grandmas and his humidity got a little low. So anyways, I got his food to where it was thawing out, and went to finish cleaning the cage, when he spit this clear liquid out on my hand. What does this mean? Is it a sign of upper respiratory infection? Or is it just something rare they do?