It is likely your gerbil died of natural causes and the other one was just disposing of its body. It is not very nice to think on but makes a lot of sense in the wild as a dead body would just...
I have learned that gerbils and hamsters or any kind of rodent are very protective of their home and food. For example if you put two hamsters in a cage with one bowl of food and one of the hamsters...
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...