Parakeet regurgitating whole seeds?

by Elizabeth
(Maryland)

My budgie, Kyu, is about 2 years old. He seems healthy enough aside from the fact that for the past two days he's been regurgitating these small yellow balls that look like seeds but at very hard (see picture). They either come out in a bunch or several fall out. He's also been a little puffed up, but I was just thinking he might be cold, because he's active enough, steps up on my finger readily with energy. But I'm baffled...regular regurgitation is supposed to be kind of mushy right? Is this dangerous?