Anaconda

Eunectes murinus
Green anaconda, Common anaconda, Water anaconda
Anaconda or “Green Nconda” belongs to boa family and is one of the biggest existing snakes. Anaconda’s females are much bigger in size than males and have clearly marked sexual dimorphism. Anacondas are mainly olive-green with black spots all around their bodies. Anaconda’s head has clearly expressed orange-yellow stripes on both sides and is narrow for its body size. The eyes, located on the top of head, help anacondas observe the surroundings without coming out of water.
Unknown

population size

10-30 yrs

Life span

16 km/h

Top Speed

30-70 kg

Weight

3-4.6 m

Length

Disrtibution

Anacondas’ major habitat is Latin America’s tropical flatlands. The anacondas are most frequently found in basins of Amazon River (Brazil), Orinoco River (Columbia) and Los Llanos (Venezuela) – vast tropical grassland plain. They are semi-aquatic animals, living partly on land and partly in water. Anacondas prefer plains, rainforests, savannas, freshwater areas as well as areas where the water is not very deep.

Habits and lifestyle

Anacondas are nocturnal meanwhile leading solitary lifestyle. The period of increased activity for anacondas is nighttime. Being water-dwelling reptiles, anacondas are fast in water while slow on land. Most of their lives they spend in water, staying under water for long periods of time. Anacondas are comparably passive at daytime heat and start moving at dusk, when the heat subsides. They often pass long distances very quickly, usually when the dry season reaches its highest point or when they look for mates.

group name

den, nest, pit, bed, knot

Diet and nutrition

Anaconda is an opportunistic apex predator, which means that it usually doesn’t have any general plan and take advantage of any chance to have a tasty meal. They usually feed on other reptiles, sheep, dogs, tapirs, fish, birds, wild pigs, deer, rodents as well as any kind of available prey that they are able to catch and swallow.

Diet

Mating habits

These anacondas are polyandrous animals, meaning that a female mates with more than one male while each male mates with only one female. Anacondas mate during the dry season, which is from March to May. Usually, the process of mating lasts up to several weeks. Females don’t eat at gestation period, lasting about seven months. For this reason, after mating, a female can eat the partner to go through this long period. Female anacondas are ovoviviparous. After incubation period, lasting 7 months, a female gives birth to up to 82 young (though the average number is 20-40). Newborn youngsters are completely independent: they don’t get any protection and care by their mother and have to be able to fend for themselves. Sexual maturity is reached at the age of about 3 or 4 years.

Mating behavior

Reproduction season

March-May

Incubation period

7 months

Independent age

at birth
female

female name

male

male name

snakelet

baby name

82 snakelets

Clutch size

Population

Population status

ne
dd
lc
nt
vu
en
cr
ew
ex

Population threats

As always, major threats have to do with human activity. In this case, it’s trade of exotic species. Anacondas are included in Appendix II of CITES (Convention on Trade in International Species). Anacondas are hunted and killed for their skin having huge demand on the black market. They are persecuted also in human settlements as being a danger for humans and domestic animals. Anacondas are also threatened by illegal deforestation on account of carelessness of the local authorities. This brings anacondas to habitat loss even in protected areas.

Population number

Currently, anacondas’ population is not officially known. However, it’s not listed by IUCN as endangered species.

Ecological niche

Being predators, anacondas feed upon a wide variety of vertebrate animals. Young anacondas, in turn, become prey for larger predators.

Fun facts for kids

  1. The word “anaconda” has Tamil origins, coming from Tamil word "anaikolra", meaning "elephant killer." After the Spanish conquest of the area, settlers called anacondas "matatoros", which means "bull killers."
  2. After long periods of being in water, anacondas are frequently seen hanging of trees to dry up.
  3. Anacondas don’t have scales in their cloacas. Their glands in this area smell like musk, which frighten small organisms, being poisonous for them. So, this smell, most likely, protects anacondas’ cloacas from leeches and ticks.
  4. In Latin, scientific name of anaconda sound like “eunectes murinus” and means "good swimmer".
  5. Anacondas can do without air under water for about ten minutes and then rise to the surface to get some air.
  6. An anaconda can be satisfied with only one meal over a long period of time, provided that the prey is large enough.