European black bear hamsters and the Syrian black bear hamsters are one and the same. In order to avoid the confusion, take note that with hamsters there are a total of 25 species grouped into 6 categories. They are products of black mutations coming from the originally Syrian golden hamster, and so the black bear belongs to the group of golden hamsters. It is a different class from the European hamster which are only found in the wild, so be careful in using such terms if you are not the scientifically inclined type of person.
The European black bear is known to be the most common pet hamster in the world. Its average size is about 6 inches long. With proper care they can live for 2 to 3 years, and some can live longer to 4 years. Of course, just like other hamsters, they are nocturnal, meaning they are active at night and sleep during the day. They are very easy to handle but need to have materials near them to chew on to keep their incisor teeth from growing too much. They feed on grains, grasses, fruits, vegetables, as well as some specially formulated hamster food. Their food should always be fresh as much as possible, so in the morning make sure you regularly remove the food in its cage.
The black bear is not difficult to clean. They stay clean most of the time and do not need baths. You may just clean them with some baby wipes.
A black bear should never be joined with another hamster in one cage. By nature, they are solitary, so they can survive without the presence of a fellow hamster. Hamsters that are joined with single or multiple hamsters are guaranteed to never last the day due to fights, and although one will survive, it is guaranteed that it will develop further fighting instincts so it will not be nice anymore to cuddle or talk with it.