Friday, 29 April 2022

The Raccoon Dog

The Raccoon Dog is native to East Asia; it was brought to European Russia at the beginning of the nineteenth century and has since spread to other parts of Europe. Because of the white area around its snout, it strongly resembles a Raccoon, but the black band on its face is broken into two parts. The forehead is light, and an even lighter, almost white area stretches over the entire neck. The ears have dark borders, and the back is mottled grey with dark stripes. 

The chest, belly, and legs are black, and the tail is unstriped and dark on top, light underneath. The legs are all the same length. Raccoon Dog is about 60–80 cm long, and the tail measures up to 20 cm. Its height at the shoulder is 20–30 cm, and it weighs up to 10 kg. The Raccoon Dog’s thick fur exaggerates its true size. Raccoon Dogs live in deciduous or mixed forests with thick underbrush, usually near water or swamps, and in open landscapes with wet areas and areas with bush cover. 

It is not a shy animal, so you might also see it near or in inhabited areas. Raccoon Dogs do not hibernate, but like Eurasian Badgers, they remain in their den for several days if there is a severe frost or heavy snow. The prints of Raccoon Dog always show four toes set an equal distance from the central pad print, as well as clear claw marks. The front footprint is 4–5.5 cm long and about 4.5 cm wide, the rear footprints are somewhat smaller, 4–4.5 cm long and about 3.5 cm wide; the stride is about 40–60 cm. 

The tracks can resemble those of a fox, although the latter are more elongated. There is essentially no visible difference between the tracks of a domestic dog and those of a Raccoon Dog, and the latter may also be confused with the tracks of a domestic cat, even though the cat’s footprints never show claw prints. A male and female often hunt together, and one often sees the prints of two animals in the same place. The footprints are often found on the muddy shores of lakes or streams or in marshy areas. 

At the water’s edge, one may often also find paths that are regularly used by the animals. A Raccoon Dog can dig its own den, but it will also use old Eurasian Badger and fox dens, or live in natural cavities: in hollow trees, under roots, or between stones and rocks. One will almost always find the remains of prey close by. Raccoon Dogs live in family groups in established territories, which are, however, not defended vigorously. 

Like Raccoons and Eurasian Badgers, Raccoon Dogs are omnivores, but they consume mainly small rodents. The scat is somewhat twisted, 5–8 cm long, 1.5– 2 cm thick, and often contains much hair. It resembles domestic dog scat but is left in piles—in latrines near the burrow or along the edge of the territory. Beware! Raccoon Dog scat should not be touched since it can contain eggs of the dwarf tapeworm (transmitted by foxes), which can be dangerous to human beings. In many places in eastern Europe, this is the reason mushrooms and berries are not gathered in the wild. 

The Raccoon was introduced from North America to Europe for the fur trade at the beginning of the twentieth century. Escapes over time have multiplied and the naturalized population in Europe has increased steadily. Raccoons are often confused with the Eurasian Badger, though Raccoons have a black stripe diagonally crossing the area above the eyes, as well as a dark blaze from the snout to the forehead. On the side of the snout, there are white areas, and the Raccoon also has white above the eyes. 

The ears have a light border, and the tail is striped diagonally with six or seven dark stripes which are longer than those on a Eurasian Badger. The coat is grey, brownish, reddish-brown, or almost black on the upper side. Raccoons are about 48–70 cm long, and the tail measures about 20–30 cm. Raccoons weigh between 5 and 15 kg. 

The hind legs are longer than the front, so they move with the hindquarters slightly raised. Raccoons prefer deciduous woodland or underbrush near lakes, streams, and rivers, but may also be found in other open areas such as parks or arable land. If it is not persecuted, the Raccoon may become quite confiding. Raccoons are normally solitary but—especially where they are fed by humans —may also live in groups. 

Raccoons are usually nocturnal; during the day they sleep in hollow trees, rock crevices, and other natural cavities, or even in abandoned Eurasian Badger or fox dens. Raccoons don’t hibernate but are noticeably less active in winter than in summer. Raccoons have long and dexterous fingers, especially those on the front feet. 

The tracks show the footprints of all five toes and the pads as well as the imprint of powerful claws. Raccoons are good climbers and can rotate their hind feet 180 degrees to maintain their hold, and they are able to climb down trees headfirst. The toes are widely splayed; the front footprint is about 7–7.5 cm long and 6.5–7 cm wide, the hind footprint 8.5–9 cm long and 6–7 cm wide.

Monday, 4 April 2022

Amber – A Precious Gemstone

Amber is fossilized tree resin, which is produced by some trees as a form of protection from disease and wood-burrowing insects. It was one of the earliest gems used for personal adornment. Of special interest to scientists are ambers containing insects, pollen, leaves, and occasionally frogs and lizards that were trapped millions of years ago as the sticky resin dripped down the tree trunk.

Ambers with inclusions provide a rare look at the plant and insect life of that time period. Most amber is brownish yellow to orange in color but it can also be blue, green, or red. Brownish colors are the least valued. The best quality amber is transparent and either has no flaws or else has very distinctive inclusions.

The majority of gem-quality amber is found along the Baltic coasts of Russia and Poland. Other significant sources are the Dominican Republic, Mexico, Myanmar, Sicily, and Romania. Beware that Amber is sometimes dyed to make it darker or a different color. The dye may fade. Be on the lookout for pressed amber (also called reconstituted amber). It’s made by heating small amber fragments and compressing them into larger pieces. It can be identified by magnification.

A lot of natural ambers are heated just to make it more transparent. Amber can be separated from imitations such as plastic by placing it in a saturated salt solution. Amber will normally float while imitations may sink. However, copal and polystyrene plastic have about the same specific gravity as amber, so amber experts find high magnification to be more useful in detecting imitations. One imitation that is harder to detect is copal, a young version of amber.

It has essentially the same chemical formula as amber but different physical properties. Copal contains liquids such as oils, acids, and alcohol, whereas in amber these liquids have evaporated, resulting in a more durable product. Besides its greater resistance to cracking and crazing, amber is much more rare and valuable than copal. 

A drop of acetone nail polish remover on the back of the material can help separate copal from amber. The acetone will make copal sticky but it will have no effect on amber. Amber scratches abrade and melt easily. If it’s left in the sun, it can dehydrate and crack. Avoid ultrasonic’s, all chemicals, brushes, and heat. To clean amber, wipe it with a soft damp cloth; or clean it in cool soapy water, rinse and dry with a soft cloth.