Help! I have a 7-year-old male glider, who just started acting strange and very aggressive. As soon as I went near his cage he started crabbing and hissing, and running around his cage franticly. He's biting at the bars of his cage and attacking his toys, hissing and crabbing the whole time. I let him out, and he just jumped on my arm and continued crabbing and tried to bite me when I touched him.
He has food and water, and nothing about his cage or environment has changed since yesterday, so I don't know why he's so upset. He's been doing this almost constantly for close to 45 minutes, I'm worried!