Blue Iguana – Cyclura
nubile lewisi; (Grand Cayman) |
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The Blue Iguana "the
most endangered iguana in the world" |
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Photo by: David Blumenthal |
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Coming out of
egg... |
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Size: Males up to 515 mm SVL*; females up to 410
mm SVL. These are rock iguanas and the habitat is open
rocky sunlit areas in dry forests or near the shore as
females must excavate cavities in the sand or soft soil
for laying eggs. They lay about 10 to 15 soft-shelled
eggs, in June and July. – Smaller, younger females
lay fewer – sometimes only 3 or 4. The young sometimes
climb into trees, although adults are never found there. Diet
includes plants, fruits and flowers, but they have recently
been observed eating snails, slugs and caterpillars.
They don’t hunt per se, but are opportunistic so
only catch very slow-moving creatures. Colour is tan
to gray with a bluish cast that is more pronounced during
the breeding season, especially in males. Individuals
vary considerably in the amount of blue colouring and
this can change according to time of year, health and
shedding. They are particularly large and bulky with
a dorsal crest with short spines from the neck to the
end of the tail. Very young iguanas do not have the blue
colouring and show light and dark bars that extend along
the back. Fossils indicate that these iguanas were very
common before European colonization, and that they were
once larger. These native iguanas evolved in the Cayman
Islands with no major predators and have few defences
against imported rats, cats and dogs. A recent field
census shows that the current wild population has been
drastically reduced. Visit www.blueiguana.ky link or www.cyclura.com link
or www.ircf.org link
for more on the Blue Iguanas and their fight against
extinction. A documentary film is being produced
by the National Trust Blue Iguana Recovery Programme. |
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| SVL |
Snout to Vent Length |
| TL |
Total Length (including tail) |
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ALL IGUANAS AREN’T THE
SAME?! |
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The |
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Blue Iguana
Drawing by Penny Clifford |
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Green Iguana
Drawing by Penny Clifford |
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Very often, people cannot tell the difference between
the native Blue Iguanas and the introduced and now vastly
more common Green Iguanas.
Cayman Islands’ endemic native Blue Iguanas are
extremely rare and survive as a viable population here
only due to the efforts of the National Trust which established
a captive breeding program for them ten years ago and
continues to maintain an active, ongoing and multi-faceted
programme thanks to the heroic efforts of Mr. Fred Burton
and a host of local and international volunteers and
sponsors.
Green Iguanas are native to Central America and were
brought to the Cayman Islands as pets. In their original
homes in Central America, they were accustomed to being
surrounded by predators like jaguars, so they are fast,
agile and able to climb trees to escape. Our native Blue
Iguanas have always lived in relative peace and tranquillity
on Grand Cayman where there were no dangerous animals.
Because the Green Iguana is bred to escape predators,
it has can escape the attacks of cats and dogs and has
therefore multiplied freely in the wild, laying clutches
of up to 30 eggs at a time. It is estimated that there
are now many thousands of Green Iguanas living on Grand
Cayman. Though, at first, the Green Iguanas were found
mainly in the West Bay area, they are now being spotted
further and further east and there is nothing to stop
them from moving to the Eastern districts where they
may become a problem for farmers.
Blue and Green Iguanas cannot interbreed. The major
threat to our Blue Iguanas is NOT the Green Iguana, but
the presence of loose cats and dogs in the ecosystem,
preying upon both young and adult Blue Iguanas. High
speed traffic is also a problem, now beginning to affect
the subspecies living on Cayman Brac and Little Cayman.
Green Iguanas can be a nuisance to homeowners. They
eat flowers and garden plants and have a very unfortunate
habit of defecating in swimming pools. Blue Iguanas can
be seen in the Botanic Park, but are practically extinct
in the wild, surviving on only one small area of native
cliff and forest near East End.
These drawings show the main differences. If you remember
that Blue Iguanas do not have stripes on their tails
and do not have spines under their chins, you will be
able to identify any iguanas you may see.
To volunteer for the Blue Iguana Project, visit the
National Trust or call 949-0121. For more on Blue Iguanas
visit www.blueiguana.ky To
see photographs identifying Blue and Green Iguanas at
all stages of life, visit www.blueiguana.ky/bluevsgreen |
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| Blue Christmas |
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Twas the night before Christmas
and all through the Salina, not a creature was stirring,
not a single Cyclura.
The stockings were piled by the boots in a heap, in the
hopes that some of us might get some sleep!
The trackers were collapsing one by one into beds, while
visions of maiden plum danced in their heads.
And iguanas in cages and iguanas in parks, had all settled
down, just before dark.
When out on the lawn, there arose such a clatter, I sprang
from my bed to see what was the matter.
Away to the window I sleepily did go, for dozens of roosters
had started to crow.
When first rays of light shone onto the floor, I knew it
was time to head for the door.
When what to my half open eyes should appear, but a tall
sleepy Fred holding coffee and gear.
With a long curvy drive going out to the park, the post-Ivan
Cayman looked roofless and stark.
With a sharp jagged pathway and a long tedious walk, I
knew in a moment it must be cliff rock.
Then gradually out of their retreats they came, and we
quietly followed and listed by name.
Came Wymp and Yerp, and Burp and Grape,
Then Gypsie and Egypt and Yarrow and Wop, came Rambo and
Wribbit and Gewpy and Gop. Out to the rock, to the top
of the retreat, the signal receiver went beep beep beep
beep.
Through trees that before the wild hurricane stood, we
followed iguanas through cliff rock and woods.
So down the trail to find lizards I walked, to retreat
49 twas Oppie I stalked.
As I punched in the code and was turning around, down fell
Oppie from a tree to the ground.
She was ridged with spines from head to tail, and patches
of skin were turning quite pale.
A piercing with beads orange pale blue and yellow, this
young female lizard was surprisingly mellow.
Her tail ringed with spikelets her toes long and slender,
at this age it's too difficult to tell them by gender.
Her head was so turquoise it looked like the sea, from
her look I could tell she was tempted to flee.
Her belly was plump, and her eyes so dark red, that they
looked like squashed berries in the sides of her head.
She blended into the rock as a measure of stealth, and
I laughed when I saw her in spite of myself.
A wink of her eye and a twist of her head, soon gave me
to know I had nothing to dread.
She spoke not a word but went on with her eating, and I
decided to type you this holiday greeting.
And here once again as the bugs start to bite,
Merry Christmas to all, and to all a good night! |
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Written by Sarah Doty, International Reptile Conservation
Foundation while on Grand Cayman assisting in the release
of Blue Iguanas for the Blue Iguana Recovery Project. |
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