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Grass snake

life science Maturity 7-9 Next article →

The grass snake, known scientifically as *Natrix natrix*, is a non-venomous colubrid snake. It is a semi-aquatic species, meaning it spends much of its time near water. These snakes are widely distributed across mainland Europe, from mid-Scandinavia to southern Italy. They also inhabit parts of the Middle East and northwestern Africa. Because they are often found near fresh water, they are frequently associated with ponds and rivers.

Młody zaskroniec - panoramio
Młody zaskroniec - panoramio

Physically, the grass snake is easy to identify by its distinctive markings. It is typically dark green or brown, but its color can range from grey to black. In colder regions, darker pigmentation is more common. This darkness likely provides thermal benefits by helping the snake absorb more heat. A key feature is the yellow or white collar located behind the head. This mark is why the animal is sometimes called a "ringed snake." The underside is white with irregular black markings, which helps people identify them in the field.

Juveniele Ringelnatter Natrix natrix auf den Langenwiesen S Grabener 25 08 2016
Juveniele Ringelnatter Natrix natrix auf den Langenwiesen S Grabener 25 08 2016

The grass snake follows a specific biological process to grow and survive. As the snake grows, it must undergo ecdysis, which is the process of shedding its skin. During this time, a new skin forms underneath the old one. The eye scales may turn a milky blue or white color. This stage is known as being "in blue," caused by an oily secretion between the layers. While in blue, the snake's eyesight is impaired. Consequently, they do not hunt or move much during this period. Eventually, the old skin sloughs off in one piece, and normal activity resumes.

Feeding and movement are closely linked to the snake's digestion. Grass snakes primarily prey on amphibians, such as the common frog and common toad. They may also occasionally eat larvae or ants. To find food, they use sight and their sense of smell via the Jacobson's organ. Unlike many other snakes, they do not use constriction to kill prey. Instead, they consume their prey live. Because their meals are often large relative to their body size, movement is impaired after eating. A snake that has recently eaten will stay in one location to bask. This basking helps optimize their body temperature to digest the meal efficiently.

Reproduction for the grass snake occurs in a series of seasonal stages. In the spring, males emerge first to bask and raise their body temperature. This helps increase their metabolism and may maximize sperm production. By April, or when temperatures are favorable, males mate with females. Between June and July, females lay batches of 8 to 40 leathery eggs. These eggs require a temperature of at least 20°C and high humidity to hatch. They are often laid in areas like compost heaps where rotting vegetation provides warmth. After about 10 weeks, the young hatch and are immediately independent.

History and classification have changed as scientists learn more about these reptiles. Fossils of *Natrix natrix* have been found in southern Hungary, dating back to the late Early Pleistocene. Recent genetic analysis has also led to new classifications. In August 2017, what was once considered a subspecies was recognized as a separate species, *Natrix helvetica*, or the barred grass snake. Other subspecies, such as *N. n. astreptophora*, have also been reclassified as their own species. Some subspecies, including the Sardinian grass snake, are now considered critically endangered.

Olaus Magnus - On the Heathen Lithuanians Idolatrous
Olaus Magnus - On the Heathen Lithuanians Idolatrous

Grass snakes also hold a deep place in human culture and mythology. In Baltic mythology, the grass snake is a sacred animal known as the *žaltys*. In Lithuania and Latvia, these snakes were historically kept as pets near the hearth. Many folk beliefs suggested that a snake living under a house protected it from fire. Even today, the grass snake remains a symbol of wisdom and education in these regions.

Romuva symbol
Romuva symbol

When threatened, the grass snake uses several unique defense mechanisms. They can produce a garlic-smelling fluid from their anal glands. They may also perform thanatosis, which is the act of feigning death by becoming limp. In some cases, they may even practice autohaemorrhage, secreting blood from the mouth and nose. They can also display aggression by hissing or striking without opening their mouths. Interestingly, they may raise their front bodies and flatten their necks to mimic cobras. This behavior may be a fossil trait from when the extinct European cobra lived in the same regions.

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🖼️ Images & Media (4)
File:Młody zaskroniec - panoramio.jpg
Młody zaskroniec - panoramio.jpg
File:Juveniele Ringelnatter Natrix natrix auf den Langenwiesen S Grabener 25 08 2016.jpeg
Juveniele Ringelnatter Natrix natrix auf...
File:Olaus Magnus - On the Heathen Lithuanians Idolatrous.jpg
Olaus Magnus - On the Heathen Lithuanians...
File:Romuva symbol.svg
Romuva symbol.svg
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