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Oct 8, 2018

Half Moon Caye Declared Rat Free

The Belize Audubon Society has successfully eradicated rats on Half Moon Caye. The invasive species were highlighted as a problem since the 1950’s and subsequent studies showed that the rats were impacting the shape and ecology of the island because they were preying on plants, invertebrates and vertebrates. Their rapid reproduction all year round showed that there were fifty-six rats per every two and half acres of the caye. This posed a serious threat to the integrity of the site which is a part of the Barrier Reef Reserve System World Heritage Site.  And to retain the site’s outstanding universal value, the invasive species had to be permanently removed.  Between 2015 and this year, an extensive elimination exercise was carried out and the Belize Audubon Society is happy to report that forty-nine years after the first attempt, the rats have been eradicated. Specialized cameras have been installed around the island for monitoring purposes and to date, no rats have been sighted. Shane Young, the Marine Protected Areas Manager, shared the good news.


Shane Young

Shane Young, Marine Protected Areas Manager, BAS

“The rats were considered an invasive species under the World Heritage. It was something that had to be addressed, among many other issues, within the World Heritage. The Belize Audubon Society decided to source an international entity to carry out a feasibility study as to whether rats can be eradicated from this island or not. The study results stated that yes we can eradicate rats and it provided guidance on how to eradicate rats. In 2016, the Belize Audubon Society, strapped with cash, we sought a local expert to assist with the rat eradication. It was done in-house under the guidance of this local expert. We were able to eradicate rats in 2016. We did two bait applications – with a unique poison. And since the rat eradication we implemented monitoring tools to verify if the rats have been eradicated. To date we haven’t sighted any rats. So, I am proud to announce that there aren’t any rats on Half Moon Caye and it is the first of its kind initiative that has been done in Belize.”


A bio security plan is being implemented to significantly reduce any risk of reintroduction of rats to the Half Moon Caye Natural Monument.

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