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.
There are more than 20 different species of hamster found in the wild (and even more in the commercial pet market). The Russian dwarf hamster are among the smallest species of hamster with adult Russian dwarf hamsters rarely growing to more than 10cm in length. The more common Syrian hamster is the largest species of hamster and some Syrian hamster individuals have been known to grow to nearly 30cm long, although the average size of a Syrian hamster is normally around 20cm. Many species of hamster are very fast at running so that they are able to escape from oncoming predators. Due to the shape and size of the hind feet of the hamster, hamsters are often able to run as quickly backwards as they can forwards, which the allows the hamsters to escape easily in their burrows.