In South Africa we have a number of species of frogs.
The most well known of them is the Platanna .(The African Clawed frog)
There are in fact two species of Platanna one which is found all over
South Africa and another the Cape Platanna which is found in the Cape only.
The two frogs are distinctly different from each other.
The common Platannas are podgy frogs with small heads and
disproportionately large hind legs while the Cape Platanna has
a smaller head and a larger body measuring some 5cm from snout to vent.
It has dark stripes on its back and mottled patterns on its stomach.
The common Platanna frog is well known throughout the world as it
is the frog that is used for pregnancy testing.
It was discovered in the 19th century by European scientists although
it was already well known by the locals who used them as a source of
protein and an aphrodisiac or fertility medicine.
The platannas are totally aquatic and will only leave their ponds
to move to another during wet conditions.
The platanna is well suited to its life in the water and is, able to
swim in all directions, including backwards. They are air-breathing
and depend on well developed lungs to breathe.
Their bodies are streamlined and slippery and they have powerful
hind legs and fully webbed toes.
Lateral sense organs are well developed which enable them to detect
vibrations in the water.
These frogs are voracious predators and also scavenge for food.
Their cousins the Cape Platanna are only found in the Cape and were
discovered in 1927.
The Cape Platanna is very picky with its habitat and because of that
it is declining rapidly.
It likes the seasonal and high acidic levels of the black water
lakelets of the Cape Floral Kingdom, whereas the common Platanna
prefers permanent standing water bodies with lower acidic levels.
Its decline was speeded up in the Cape Nature Reserve when larger
animals were introduced to the park. This necessitated some of its
water holes to be enlarged and allowed the common platanna
access to it.
The result was that the two frogs started to interbreed and all males
produced from these matings were sterile.
Another problem is that the common Platanna takes over the habitat of
the Cape Platanna and feeds on its tadpoles.
To avoid the extinction of the Cape Platanna 300 of them have been
caught and placed in other Reserves to protect them.
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