No.
Nope
no
It's not a good idea. Gerbils can live together in groups of several, if the cage is large enough. Hamsters, on the other hand, live very solitary lives and will fight with other hamsters when they become adults. I have never seen a hamster and a gerbil living together, and I can only imagine that the hamster will attack the gerbil if left alone with it for more than a couple hours.
Naturally, they live in the desert
They live in the desert.
Gerbils can (and should) live with a gerbil friend or two of the same sex--that's it. No other animal is safe to live with a gerbil in the same cage or tank.
Gerbils should always have another gerbil living with it, it provides a much more happier home if its got another gerbil to communicate with. They get lonely and can sometimes die out of lonelyness. They like to groom each other and love the company. They help each other all the time and they live in small groups in the wild. Hope this helps :) x
3-5 years
3-5 years
An average of 3 - 5 years, but the oldest gerbil on record lived to 7 years!!
If your gerbil is healthy, it should just dig by itself. Gerbils are natural diggers, as they make burrows to live in in the wild.
Not sure why the gerbil would be sad, unless he is alone. Gerbils are highly sociable and need another one to live with.