Tag Archive: Squamata


TAXONOMY
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Squamata
Family: Boida (Boas)

Genus/species: Eunectes murinus

GENERAL CHARACTERISTICS  Can grow to more than 29 feet (8.8 meters), weigh more than 227 kilograms (550 pounds) and measure more than 30 cm (12 in) (30 centimeters) in diameter. Gigantic, heavy-bodied, dark green boa with dark spots.  A distinctive stripe runs from the rear edge of the eye, diagonally downwards to the back of the head. The stripe is edged with black and varies in colouration, from greenish to orange. Eyes and nasal openings are on top of their heads, allowing them to lay in wait for prey while remaining nearly completely submerged. The female dwarfs the male and is almost five times heavier. 

Anaconda 8629891977_66e2cd6195_b

DISTRIBUTION/HABITAT South America: Amazon and Orinoco drainages from Colombia and Venezuela to East Bolivia and Central Brazil. Associated strongly with watercourses, swamps and other freshwater locations.

DIET IN THE WILD Monkeys, deer, peccaries, pacas, agoutis, birds, fish, caiman and turtles. Prey usually killed by constriction; prey suffocates but is not crushed. Usually feed in water. Jaws attached by stretchy ligaments allow them to swallow their prey whole, no matter the size, and they can go weeks or months without food after a big meal. Primarily a lie-in-wait predator.

IMG_7000 

REPRODUCTION  Female Anaconda retain their eggs and give birth to two to three dozen live young. Baby snakes are about 0.6 meters (2 ft). After mating, the female may eat one or more of her mating partners, as she does not take in food for up to seven months.

MORTALITY/LONGEVITY: Lives to over 29 years.

REMARKS: The Anaconda is, pound for pound, the largest snake in the world. Its cousin, the reticulated python, can reach slightly greater lengths, but the enormous girth of the Anaconda makes it almost twice as heavy. Can remained submerged for a very long time lying in wait for its next meal.
The California Academy of Sciences specimen is a female. Length/wt 2013: 13 ft 11 inches long and weight 92 lbs.
2008 she was 3m (10 feet) long and weighed 90 lbs.

IMG_6987

Color of Life Note: The dark brownish-green Anaconda demonstrates concealment by laying hidden in the murky waters of the Amazon. It is more visible at the California Academy of Sciences exhibit water which is markedly more transparent.

References

California Academy of Sciences Steinhart Aquarium Flooded Amazon Anaconda Exhibit 2018

U. of Michigan Animal diversity Web animaldiversity.ummz.umich.edu/accounts/Eunectes_murinus/

Encyclopedia of Life  eol.org/pages/794661/overview

 Ron’sWordpress shortlink  http://wp.me/p1DZ4b-bt

Ron’s flickr   http://www.flickr.com/photos/cas_docents/sets/72157608449603666/with/3636385495/

TAXONOMY
Kingdom: Animalia
Phylum: Chordata
Subphylum: Vertebrata
Class: Reptilia
Order: Squamata
Suborder: Serpentes
Family: Boidae

Genus/species: Boa constrictor constrictor

Red-tailed Boa IMG_0186

GENERAL CHARACTERISTICS: The background color is cream or brown that is marked with dark “saddle-shaped” bands. The head of a boa constrictor has 3 distinctive stripes. First is a line that runs dorsally from the snout to the back of the head. Second, there is a dark triangle between the snout and the eye. Third, this dark triangle is continued behind the eye, where it slants downward towards the jaw. However, there are many variations on appearance.
Length to 13 feet (3.9 m) as adults. Generally between 2 and 3 meters(6.5 – 10 feet) in length. Weigh 40 to 50 pounds.

DISTRIBUTION/HABITAT: Exclusive to the New World (Mexico to Argentina). Boa constrictors are both terrestrial and arboreal. They are found in deserts, wet tropical forests, open savanna, and cultivated fields, and from sea level to moderate elevation having the least need for water of all boas.

DIET IN THE WILD: They ate aglyphous, meaning they do not possess any elongated fangs. Instead, they have rows of long, recurved teeth of about the same size. Teeth are continuously replaced. They are carnivores eating small mammals, including bats, and birds or anything that fits in their mouths. Prey are killed by constriction and swollen whole taking 4-6 days to digest.

REPRODUCTION: Fertilization is internal. The male uses pelvic spurs (hind leg remnants found on either side of the cloacal opening) to aid the use of hemipenes (double penis) for cloacal insertion. Females give birth to live young (ave. 25 in number).

Red-tailed Boa 2775385563_c91e7827ff_o

MORTALITY: Lifespan, 25-30 years.

PREDATORS  Include humans, jaguars, and crocodile 

CONSERVATION : IUCN Red list; not evaluated.

REMARKS: In Mexico and South America, they are valued as destroyers of rodents. B. constrictor constrictor have been “domesticated” for this reason.

Color of Life Note: The Red-Tailed Boa demonstrates concealment with its beige and dark brown markings hiding it in the filtered light coming through tree branches and leaves.

References

California Academy of Sciences Flooded Amazon Exhibit 2015

Ron’s WordPress Shortlink  http://wp.me/p1DZ4b-VA

Ron’s flickr  http://www.flickr.com/photos/cas_docents/sets/72157608449603666/

U. of Michigan Animal Diversity Web animaldiversity.ummz.umich.edu/ site/ accounts/ information/ Boa_constrictor.html.

Smithsonian National Zoological Park  http://nationalzoo.si.edu/Animals/ReptilesAmphibians/Facts/FactSheets/Boaconstrictor.cfm

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