I have a gerbil that I bought in a pair from a well known and well disliked (on here) pet shop.
I'm the first to admit I was very silly and just went in with a view to getting a small first time pet for my children.
I was offered these 2 gerbils and set up and assured that even if we don't get on with them, they only live for a maximum of 2 years.
One did indeed pass away peacefully at the 2 year mark but her sister is now 4.
Luckily we love the little rodent and she's a spoilt old lady.
However she keeps trolling me, burying herself in a tunnel and then staying very quiet and still for very long periods of time until I declare to DH that she's died and get upset... then she will generally pop her head out and come and play with what I swear is a smirk on her face.
This has happened a fair few times and today she's the same, I've not seen her in a couple of days and I can see where she's buried but she's not moving and not coming out, even to a gentle tap on the tank to offer a treat.
I'm sure she's passed away but I'm squeamish and I have 2 very young children here so I'm not willing to delve my hand in and see.
I am going to have to wait for DH to investigate if she's not shown her whiskers by then.
I'll be sad if she has gone but she has spent 4 years being thoroughly loved and pampered, she's completely blind but she enjoys mealworms and sunflower hearts.