Dwarf Crocodile

Osteolaemus tetraspis
African dwarf crocodile, Broad-snouted, Bony crocodile, African broad-nosed crocodile, Black crocodile
The Dwarf crocodile is a rather small crocodile with short, blunt muzzle and black body except with the under parts, which are yellow in color. The body is covered by bony plates, which form coarse, armored scales on the skin of the animal. These scales protect the crocodile from injury as well as from getting burnt, lying under the hot sun. When the crocodile is submerged, its eyes and nostrils remain above the water surface, allowing the animal to see and breathe. This also helps the crocodile be unspotted while watching for prey and predators. Young crocodiles are identified by yellowish markings on their head and light brown stripes on their body and tail.
25-100 Thou

population size

40-75 yrs

Life span

17 km/h

Top Speed

18-32 kg

Weight

1.7-1.9 m

Length

Disrtibution

The Dwarf crocodile is an African reptile. The area of its distribution stretches from sub-Saharan regions to west-central Africa, from southern Senegal to the Democratic Republic of the Congo, reaching as south as northern Angola. The primary habitat of the Dwarf crocodile is rainforest. The reptile occurs in tropical lowland regions, where the animal inhabits swamps with dense vegetation, slow flowing currents and rivers. In addition, the Dwarf crocodiles are sometimes found in savannah pools.

Habits and lifestyle

This reptile is a nocturnal animal. The Dwarf crocodile is solitary hunter, preying at night on small animals either in water or on the river banks. The crocodiles spend the daytime hours resting in burrows, which are usually placed along the river bank, dug into the ground, having long, several meters long entrance and exit tunnels. When it's hard to find a suitable burrowing site, the crocodiles live among immersed tree roots, hanging into the water. Being cold-blooded animal, the crocodile has to constantly maintain its body temperature. When the temperature is low, the reptile takes sunbaths in order to warm up. To cool down during the heat, the animal enters the water. The crocodiles tend to lay an ambush, when in water: their body is submerged, while the eyes and nostrils are above the surface, due to which the reptile is able to hide from predators and make a surprise attack, when prey appears.

group name

bask, congregation, float, nest

Diet and nutrition

These reptiles are carnivorous, typically hunting birds, frogs, toad, rats, fish, crustaceans and other small animals. In addition, when the food is scarce, the animals can occasionally consume carrion.

Diet

Mating habits

The Dwarf crocodiles are polygynous animals. Usually, a male crocodile mates with females, occupying his territory. They breed from May to June. The female is responsible for constructing the nest: she builds a mound out of decaying vegetation, laying up to 20 eggs. During the following 3 months, the vegetation rots, producing heat, which helps incubate the eggs. The female keeps an eye on the eggs, protecting them from predators. Then, as she hears the call of her offspring, the mother unearths the eggs, helping the hatchlings come out. After the young hatch out, the female gently and carefully picks them up in her mouth, introducing them to the water. The Dwarf crocodiles usually reach independence quite quickly, but tend to remain nearby their mother for the first few weeks of their lives, sometimes even longer. Sexual maturity is reached at 5-6 years old.

Mating behavior

Reproduction season

May-June

Incubation period

3 months

Independent age

at birth
cow

female name

bull

male name

hatchling

baby name

20 eggs

Clutch size

Population

Population status

ne
dd
lc
nt
vu
en
cr
ew
ex

Population threats

In some areas of their natural range, the animals are threatened by local people, who hunt the crocodiles for their meat. On the other hand, increased human activity throughout the area of their natural habitat is another serious concern to the population of these reptiles. The Dwarf crocodiles are threatened by the development of human settlements within their home range. They are exposed to alteration and loss of habitat due to forest clearance for the timber industry as well as invasion of agricultural plantations such as palm oil. In addition, the clearance of their rainforest habitat in order to produce grazing areas for livestock, has sharply decreased the area of their distribution, particularly because these animals are not welcome by farmers, who fear for their livestock.

Population number

The overall population of this species in the wild varies from 25,000 to 100,000 individuals. On the IUCN Red List, the Dwarf crocodile is classified as a Vulnerable species within its habitat.

Fun facts for kids

  1. In the past, people considered the Dwarf crocodiles to be cannibals due to the fact that mother crocodile can often be seen carrying her offspring in the throat pouch of her mouth to help them get to the water.
  2. They usually spend the greater part of their time in the water. The crocodiles propel themselves in the water with the vertically flattened tail. When on land, the animals get around by galloping on the ground.
  3. When hatching out of eggs, the young emit loud calls, which serve as a signal for their mother, who unearths the eggs, helping them come out and carrying them to the water.
  4. The Dwarf crocodile possesses eyelids, which close as the animal submerges, protecting the eyes in the water, meanwhile not hindering their vision.
  5. The crocodile also has a throat valve, which allows the animal to swim with the open mouth without swallowing water.
  6. It is known that some ancient species of crocodile were as long as 50 feet, which is longer than a school bus.