A question about カブトムシ (Kabuto beetles)

So we’ve had this カブトムシ since the start of summer. We found it on a farm and took it home and gave it a nice big house with logs and sticks to climb.

After about a month, we noticed one of his legs had broken off at the elbow or first joint (if that makes any sense). We rairly handle him so I know it wasn’t because of that but I found his leg in the corner. He was fine without it so I never really thought much of it.

Fast forward two months and I just noticed today that pretty much all his legs are amputated at the “elbow” or “wrist” (sorry guys, I’m not a beetle anatomy expert).

Like I said, we never really pick him up so these much have just called off.

I Google’d it but nothing came up.

I guess he’s at the end of his natural life as summer is ending and I wonder if this is normal for these little guys – legs fall off, they fall from the tree, some other animal eats them.

Anyway, just wanted to see if there was anybody out there who knew about these things.