Creature
Fast Facts
Introducing you to extinct species.
THE RODRIGUES
GIANT DAY GECKO
1. The Rodrigues giant day gecko, Phelsuma gigas, lived in the trees of Rodrigues and several small surrounding islands in the Indian Ocean. 2. The Rodrigues giant day gecko ate insects, nectar, and other day geckos including the also extinct Rodrigues day gecko, Phelsuma edwardnewtoni. 3. Some plants on Rodrigues co-evolved with the geckos, creating colored nectar that attracted the two extinct day geckos to aid them in pollination. 3. Even though it was called a day gecko, it was reported to be nocturnal. 4. In 1708 François Legaut described the Rodrigues giant day gecko as, “of greyish colour, and very ugly: they are as big and long as one’s arm.” 5. All specimens of Plelsuma gigas have been lost, so the exact color pattern and size is known from primary sources. The Rodrigues giant day gecko was possibly the largest day gecko. IT was thought to be 16 - 20 inches in total length. 6. People did eat the giant day geckos and reported, “Their flesh is not bad.” 7. The Rodrigues giant day gecko was charcoal gray with triangular patterns on its back, striping on its tail, and light yellow underside. It had a pink tongue. 8. The last Rodrigues giant day gecko was collected by a French librarian named Liénard offshore islet of Ile aux Fregates in 1842. It lived for several months refusing to eat anything given to it, except for sugar water. This captive gecko’s death marked the extinction of the giant, pollinating day gecko, Phelsuma gigas. 9. Today, only a few bones of the Rodrigues giant day gecko remain in collections.
Extinction
Cometh
Facing the light at the end of the tunnel
EXTINCTION DATE
1842
The Rodrigues giant day gecko was common on Rodrigues before people arrived. These arm length geckos preferred to live in trees, especially the Latin palms. Their diet was reported to have consisted of insects and invertebrates, but its favorite food was soft fruit and nectar. This made the Rodrigues giant day gecko extremely important to the distribution of pollen throughout the island. Even though Phelsuma gigas was called a day gecko, by all reports it was a nocturnal lizard. The Rodrigues giant day gacko’s extinction began with the arrival of people and the invasive species brought with them. It was a slow process. Rodrigues wasn’t colonized until over 700 years after it was known to exist in the Indian Ocean. In the 900’s, the Mascarene Islands were first described on Arabic maps. They called Rodrigues,“Desert Island” or Diva Harab (ديفا هاراب). Rodrigues was named after Portuguese explorer Diogo Rodrigues in 1528. Rodrigues was occupied by many countries while exploring routes to the Spice Islands. In 1691, the Huguenot François Leguat tried to set up a farming colony, which failed due to its dry climate. The island was used to replenish supplies of water and food like giant tortoises and birds. In 1735, the French established the first permanent settlement on Rodrigues. Today, Rodrigues is part of the Republic of Mauritius. The downfall of Rodrigues giant day gecko began with the arrival of people to the island. They were a large lizard and “their flesh was not bad”, so were a target of early ships that stopped by the island to stock up on supplies. Once a colony was established, people began cutting down trees and burning sections of the forest. Since the Rodrigues giant day gecko spent most of its time in trees, its range became limited. Like so many animals on other islands, the final blow came with the arrival of rats and cats to the island. These new predators finished off the remaining day geckos. The last Rodrigues giant day gecko was collected by a French librarian named Liénard offshore islet of Ile aux Fregates in 1842. It lived for several months refusing to eat anything given to it, except for sugar water. This captive gecko’s death marked the extinction of the giant, pollinating day gecko, Phelsuma gigas. Although Jurassic Park is fiction, scientists are working on several de-extinction projects. In fact, in 2003 scientists did bring back the extinct Pyrenean ibex, a type of wild goat, for 7 minutes before it died, showing de-extinction is possible. The Rodrigues giant day gecko might be a candidate, because there are still bones remaining in museum collections although there are no specimens with soft tissue. If the Rodrigues giant day gecko was brought to life, could it ever be reintroduced to its native homeland in Rodrigues and nearby islets? This very question is wrapped up well by the observations by Ben J. Novak who works with Revive & Restore, a scientific group looking into de-extinction projects like the dodo and Mauritius giant tortoises. Mr. Novak said, “My time in Mauritius was a true crash course in the nation’s proud conservation movement. Mauritius, while having lost the majority of its endemic species, is home to some of the most incredible recovery projects of endangered species anywhere in the world. For example, after having declined to only 12 individuals in 1968, the population of Rodrigues Fody, a small, red-faced songbird, has recovered to over 8,000. Mauritius has pioneered innovative hybrid programs of in situ and ex situ conservation recovery, exemplified by the Mauritius Kestrel recovery; the population has grown from a single female and 3 males in 1974 to over 400 individuals today. And it is one of the first countries to replace an extinct species, the endemic Mauritius Giant Tortoise, with a living ecological surrogate – the Aldabra Giant Tortoise. In essence, Mauritius has already done de-extinction the non-genetic way.” It seems that if the Roridgues giant day gecko was ever brought back, Rodrigues and other Mascarene islands have already done much to prepare for its return.
COMING SOON
The Rodrigues giant day gecko's Lazarus tale has yet to be written, but what adventures will await it when it returns to Rodrigues Island? Stay tuned to find out.
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VIDEOS & ADDITIONAL INFO
Rodrigues Giant Day Gecko Information
Francois Leguat Reserve Rodrigues
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Madagascar Giant Day Gecko Information
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Madagascar Giant Day Geckos as a Pet & Invasive Species