Originally published in The Manitoban, March 2, 2011
They say it is better to have loved
and lost than never to have loved at all and in general, I agree.
After all, Alzheimer's aside, memories are forever right? So let's
let the good times roll and get on with it.
You may not know why, but that brief
yet significant introduction brings me to this week's subject: the
crested gecko, Rhacodactylus ciliatus.
Crested geckos are
endemic to New Caledonia, an island located just about halfway
between Australia and New Zealand (Dear New Zealand, I am sorry about the
earthquakes). I've talked about the unique situation islands pose for evolution and speciation before, so I'll just point
out that roughly 86% of New Caledonian reptiles are not found
anywhere else in the world (they are endemic).
Originally described in 1866,
the crested gecko was believed extinct until it was rediscovered by
science in 1994.
Since that time, and due to the relative ease with which they can be
bred in captivity, crested geckos have become widely popular as household pets.
Permit me, if I may, to briefly state
that captive crested geckos require full spectrum UV lighting, at
least 50% average humidity, and temperatures between 20 and 26°C.
Their enclosures should be tall enough to permit climbing, they
should have things to climb on, you cannot keep mature males
together, and they do best with a variety of live invertebrates and
fresh fruits supplemented with commercially available vitamins and
calcium. Don't let anyone tell you any different.
There are six species in the genus
Rhacodactylus, all of which are found only on the island of New
Caledonia.
One species, the New Caledonian giant gecko, R. trachyrhyncus,
is listed as endangered by the International Union for Conservation
of Nature (IUCN)
and is also the largest known gecko on the planet! In gecko
terms, the 34 centimetres length R. trachyrhyncus can
reach, definitely warrants giant status.
In contrast, R. ciliatus,
the species most often sold in stores, generally reaches
lengths of 10 to 26 centimetres, about half of which is tail.
Crested geckos are nocturnal,
predominantly arboreal, and very cute. They can be various shades of
brown, grey, and red and their colour may become more or less vibrant
depending on the environmental conditions and time of day.
Their name
derives from the fact that they have lightly spiked fringes on either
side of the head which run from the base of the eye, over the dorsal
surface of the orbit (eye socket), and down towards the neck.
This gives them the appearance of having long, flirtatious eyelashes,
enhancing their popularity in the pet trade, but more importantly
acting to deter potential predators.
Crested geckos do not have eyelashes.
They have a thin, transparent layer of skin called a nictitating membrane
which can be drawn across the eye to protect and moisten it. One of my
favourite things about crested geckos is that they often just sit and
lick their eyeballs, especially after eating. Their tongue is very
long and soft, with a widened spatula-like tip. Nothing else that can
lick its own eyeball has ever looked so endearing while doing it, let
me tell you.
Unlike other lizards, crested geckos
have a prehensile tail, which helps them grip branches whilst
roaming about the lush rainforests of New Caledonia. In addition,
their tail is flattened at the tip and equipped with minute
transverse folds called lamellae. These lamellae are further divided
into many tiny bristles, or setae, made of a hard organic protein
called keratin. The setae get even more complex under a microscope;
they are further sub-divided into minute hairs, only 200 nanometers
in diameter.
The broad toe pads of the crested and many other gecko species have
these same features, which vastly increases their surface area and enables
the gecko to climb vertical and very smooth surfaces with great skill
and agility.
Part of this adhesive magic involves the weak van der Waals forces
you may have tried to ignore in chemistry class.
Crested geckos are currently being
reviewed by the Convention on International Trade in Endangered
Species of Wild Flora and Fauna (CITES) for classification. Only two
of the six species have
so far been classified, with R.
auriculatus
listed as least concern R.
trachyrhyncus
endangered.
This article dedicated
to the memory of Mr. Twist
Mr. Twist (2004 - February 16, 2011) |
No comments:
Post a Comment