Kato - the name is African, and means "second of twins", and he has a beautiful twin sister - Jira.
He is an African pygmy dormouse, and is veeery small. They can squeeze out of almost everything, and is therefore kept in a nice terrarium, which is decorated with climbing tree, hiding places / caves of wood and lots of running space.
He is about 7 weeks old.
They are active at night! :-)