
Amphibians
of
Australia
'Amphibians'
are
vertebrate
animals that breathe through gills as juveniles
(tadpoles)
and through lungs as adults. .
All native amphibians
in Australia are frogs - we have no native
toads, newts,
salamanders
and
caecilians
(although some of our 'bumpier' frogs are
referred to as 'toads' or 'toadlets' and the cane
toad has been
introduced from South America)
There
are
four frog families in Australia:
- two
large
families (treefrogs and 'southern' frogs) found
throughout Australia: their ancestors
appear to have been with us when we were part
of the southern
supercontinent of Gondwana. Most Australian
frogs belong to one of
these families.
- two
families (narrow-mouthed and 'typical' frogs)
found only in far
northern regions: their ancestors probably
joined us when Australia
drifted close to Asia. We have just a few
species
We
also
have one
introduced species of toad
Remember this diagram to recall the two large
families and the two much
smaller (in Australia at least), northern families:
Click on the
above families for a brief description of
each. For further
information try our links for
frogs

Hylidae
-
treefrogs
and
their
relatives
Found
throughout
Australia
- many species
Their life
history is pretty conventional - they lay eggs
in the water,
these
hatch into tadpoles and later metamorphose (change their
form) into
adult frogs. Compare this with the 'southern frogs' and
narrow-mouthed
frogs below.
Most species belong to the genus Litoria, which
includes the true
treefrogs and others that don't often climb trees.
Many have extended toe-pads and
finger-pads to assist them in climbing (see
picture of the green
tree frog to the right , also the orange-eyed
treefrog pictured
at the top right of this page)
One of the
most
commonly-seen treefrogs is the little sedge-frog (see
picture to the
left), which often sits on
reeds or low shrubs, even during the day, and can be
brown or green, or
a mixture of both.
Another is the much larger green tree frog, sometimes
encountered in
gutters, drainpipes, laundries and toilets, and
often heard
calling on warm wet evenings.
Emerald-spotted treefrogs have a distinctive
'machine-gun call'
Most frogs are pretty quiet during the cooler months,
but the whistling
treefrog can often be heard calling throughout winter.

Rocket
frogs
belong
to Litoria but
spend
most of their time on the ground. They not only have
pointed,
rocket-shaped noses (see the broad-palmed rocket
frog to the
left), but launch themselves vigorously into the
air when
disturbed.
Another species that doesn't seem to climb much is the
stony creek
frog (pictured to right). The male's sides turn bright
yellow in
breeding season
Several
other species
in
this family belong to the genus Cyclorana,
like this water-holding frog C.
platycephala
(pictured to left) we found in the
southern Queensland outback in early 2010.
Myobatrachidae
-
the
'southern
frogs'

There are many species in this family throughout
Australia
Pictured
to
the
left is the great barred frog, which gives a deep "Walk,
walk-walk"
call, mostly at night but sometimes in daylight hours.
Some
of
the
'southern frogs' have bizarre breeding habits - e.g. the
hip pocket
frog (the male raises the tadpoles in his
'pockets'), he gastric
brood frog, which, like several of our frogs, seems
tragically to now be
extinct (see 'amphibian declines' below).
Microhylidae
-
narrow-mouthed
frogs,
This
is
a
family of small frogs found across most
of the world's tropical regions.
The Australian species lay eggs that hatch
not into tadpoles but into ready-formed frogs
Ranidae
-
the 'typical' frogs
Thus
family
is
found throughout
most of the world, but only one
species in Australia
The
ancestors
of the narrow-mouthed and 'typical' frogs presumably
joined us
relatively recently from south-east Asia, which at
least partly explains their fart northern distribution,
whereas
the other two families have been with us since we were
part of
Gondwana, and have had time to spread throughout the
continent
An
introduced toad
We unfortunately
also have an introduced species of Bufonidae - the cane
toad - which
has been poisoning native mammals, reptiles and birds
that eat it, and
has been multiplying into large numbers and spreading
across vast areas
of eastern Australia since its release in the north
Queensland
cane fields.
Further
information
|