The space in the thoracic cavity between the concave inner surfaces of the lungs, in which (in a special pericardial cavity) the heart is located, is called the mediastinum. The thoracic cavity is lined with a serous membrane called the pleura. The lungs are enclosed in the so-called pleural cavities, which are separate in man but communicate with one another in the majority of mammals. The shape of the thoracic cavity depends upon the shape of the thorax and the position of the diaphragm.
We sell 5 hammock sizes on the Traditional Hammocks (no spreader wood bars). Therefore, the length of the hammock is the same for each size but the difference is the width. Width gives the size. The larger the size, the wider and bigger the hammock.
Cages for your Roborovski. 1  Roborovskis are one of the most lively and agile hamster species and although they are among the smallest, they need just as much space as any other hamster. A cage with a minimum floor size of aproximately 50cm by 30cm (20 by 12 inches) for one pair of Roborovski is about right. Even if a cage consists of multiple levels, try to keep those minimum ground floor sizes in the back of your mind.