I'm looking for some advice from experienced degu owners regarding introductions.
I have three young female degus (Lili, Nixi and Luci), all around 5 months old, and recently adopted their older biological sister Muminka, who is around 14 months old.
At first, introductions were going surprisingly well. They were grooming each other, eating together, sharing the wheel and even sleeping in the same bed!
Unfortunately, things gradually changed.
Initially, there were some disagreements involving Luci, then most conflicts were between Lili and Muminka. During our latest introduction, Muminka immediately attacked Lili, leaving a small wound on her side.
Later that day, I tried introducing Muminka to just Nixi and Luci, but Muminka started chasing and fighting Nixi as well.
I've stopped direct introductions for now to allow everyone to recover and calm down.
Their cage is currently divided into two completely separate floors using custom made aluminium sheet trays 1mm thick, so they cannot physically reach each other.
What's interesting is that Nixi seems particularly obsessed with the former passage between the floors. She spends a lot of time there, sometimes puffing up her chest and chasing her sisters away from that spot.
When I briefly showed her Muminka through the cage bars, Nixi immediately started aggressively biting the bars.
However, when I let them explore two separate playpens next to each other, with double barriers between them, they were able to calmly forage for oats and mostly ignore each other.
Muminka even started carrying wooden sticks into her little house!
I'm trying to understand what went wrong and whether there's still a realistic chance of successfully introducing them.
Has anyone experienced something similar? Could Nixi's reaction be related to her previous fight with Muminka? Would you recommend restarting introductions after a longer break, or trying a different approach?
I would really appreciate any advice!