Habitrail

It is a series of translucent plastic tubes and "houses" for use in home terrariums, designed specially for hamsters.

Conversely, Habitrails tend to be too large to work well for dwarf hamsters, such as the Roborovski and White Russian types, as they can not climb up the tube.

In response, the Rolf C. Hagen Corp. introduced two new housings in 2007: the Habitrail OVO, which featured a larger modular design that also made it easier to observe hamsters and maintain their housing, and a similar cage with narrower tubes designed for dwarfs.

The high & smooth stairs leading to the feeding dish tend to be difficult for smaller hamsters to negotiate.

The word "habitrail" is also used in reference to enclosed pedestrian walkways, particularly those with few or no side branches, offering no personal choice of route, and those interconnecting unpleasant workplaces such as factories and office buildings.