It is nothing like that,at all
They're moody but not at all agressive.They have never ever acted agressive towards me they at times get upset ,Orpheu once get upset because I didn't let him out of his cage so when I tried to close his cage door he bite me,that was the only behaviour that could be considerate agressive.Researching on the jeaulosy theme I came across a video of a chinchilla grooming his owner during a cudlle session and I must say that It looks exactly with what Ãcaro does,the thing is he does it quite hard.
Orpheu on the other hand seems to explore my fingers but really really hard,he doesn't seem agressive just very curious.But I'll try to pull him back as you've said when he does that.
https://www.youtube.com/watch?v=bZh43tSwxnI I meant this video,he does it a lot like that chin but really hard.Is just his tough nature that makes him "bite" me so hard?
The noiseI said Icaro does when I give his brother attention first and then go to him I guess it's called barking.But he doesn't stand on his feet,he just barks at me with his back turned to me.After a few minutes he let me pet him again,but first he makes some other noises that kind of seem that his sulky.I guess I could use a different word from bitting but my english is not so great,it's kind of a soft bite that sometimes transforms to a harder bite that will leave their teeth mark on my fingers.But they have never bite me so hard that I would bleed.Thank you for your reply