Nibbling

[Bitsato]

Hey, I didn't find another thread about this, though I'm sure there is one.. Sorry
Anyway, my two boys always nibble on my finger, when I put my hand in their cage. Even when I haven't been handling their food, so my hand doesn't smell like it. It doesn't hurt either, it more like tickles.
Is it about dominance or affection?

 

[gizzy]

l would say they like your smell, and the tast of the salts that are natraly on your skin