Friday, 2 April 2021
Thursday, 1 April 2021
29-3-2021 BIOPARC, VALENCIA - DUMERIL'S BOA (Acrantophis dumerili)
Acrantophis dumerili, commonly known as Dumeril's boa, is a species of non-venomous snake in the family Boidae. The species is endemic to Madagascar. No subspecies are currently recognized.
Adults of A. dumerili usually grow to 6.5 feet (2 m) in total length (including tail) with the maximum reported to be 8 foot, 6 inches (259 cm). Males usually have longer skinnier tails, while females tend to be larger overall.
A. dumerili is found on Madagascar. The type locality given in the original description is "Amérique mérid. ?", which is later given as "?" by Jan (1863).
Along the western coast and southwestern regions of Madagascar, it is found in a semi-arid habitat that gets fairly low amounts of precipitation.
The diet of A. dumerili consists of small animals, such as birds, lizards, and small mammals, including juvenile lemurs. It is also known to prey on other snakes.
In A. dumerili sexual maturity is reached within 3 to 5 years of age. Males have anal spurs, which are used in courtship. The mating season is March through May, and the young are born some 6 to 8 months later. Ovoviviparous, females give birth to a litters of 6-28. Neonates are 12-18 inches (30–46 cm) long.
Once exported from Madagascar in great numbers, trade in A. dumerili has since been heavily restricted. The species is, however, quite prolific in captivity, and captive bred individuals are easy to find in the exotic pet trade. Though its size makes it more suited to someone experienced with large constrictors, it has a typically docile nature, and readily feeds on rats. The main concern is that it is prone to stress, which can sometimes cause it to stop eating or can contribute to other health issues.
Wednesday, 31 March 2021
29-3-2021 BIOPARC, VALENCIA - FOREST SITATUNGA (Tragelaphus spekii ssp. gratus)
Social organization: Sitatunga are semi-social, non territorial, and sedentary. Swamps are highly productive ecosystems and sitatunga's can live at densities of 55/km^(2) or higher. Females tend to form herds and males associate together or with females until sub adult. As adults, males avoid one another.
Activity: Sitatunga's move through the swamp along established pathways. These have numerous side branches leading to feeding grounds and neighbouring riverine forest. They are active both diurnally and nocturnally and may move into marshy land at night. They typically feed at any hour in areas where they are protected. They also lie on platforms of vegetation that each animal prepares for itself by repeated circling and trampling. They also stand and ruminate in the water.
Locomotion: Sitatunga's are slow and clumsy land runners, but their plunging run works well in water. Their broad and splayed hooves keep them from sinking in soft ground as deeply as other ungulates. They are usually slow and inconspicuous, and are good swimmers.
Vocal communication: Males often bark at night, sometimes as an alarm signal, or perhaps as a way of announcing their location. Females have a single higher-pitched bark. A male following a female in a low stretch may utter a suppressed roar. (Estes, 1991)
Alchornea cordifolia, common around Lake Victoria, provides a favourite browse for sitatunga. Foraging takes place in both dry land and swamp. Sitatunga select plants in the flowering stage. They often emerge at night from swamplands to graze on nearby dry land, as well as in adjacent forests where they browse on foliage and creepers. Feeding activity is apt to be concentrated in a small area of swamp for many days at a time, then they suddenly shift to new grounds. Sitatunga feed while immersed up to their shoulders and move slowly through the vegetation. Sometimes forelegs may be immersed while hind legs are elevated. They may rear to reach flowers of tall reeds, sedges, grasses and foliage, and males have been known to break branches with their horns. When feeding on long leaves, a sitatunga wraps its tongue around a clump, pulls it into its mouth, and crops it with its incisors.
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