this post was submitted on 31 May 2024
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Four baby tuatara found at Invercargill demolition site (www.rnz.co.nz)
submitted 5 months ago by Dave to c/newzealand
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The four animals ranged in size from 11 to 12cm and weighed between five and nine grams, meaning they were likely less than a year old.

Council parks and recreation manager Caroline Rain said the enclosure had been thoroughly searched prior to the tuatara being moved in February 2023, meaning the babies had likely been in egg-form at the time.

"We did everything you'd expect us to have done to ensure that there wasn't anything there," she said. "They were genuinely just missed, they were not seen."

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[–] gibberish_driftwood 2 points 5 months ago* (last edited 5 months ago) (1 children)

Yes. What they found for rabbits, back in the day whilst figuring out how to design it, was that they'd always go right up to the fence and then try to dig. If they hit metal then they'd move sideways rather than backwards, so the skirt goes about 40cm outwards and that prevents all the rabbit incursions.

At the time I don't think they ever imagined the need to design for tuatara burrowing outwards, but probably good that it's only starting to become a question at about the time they've been planning for the fence to be replaced anyway. It'll be interesting to see if and how this affects all the other fenced sanctuaries that have sprung up later.

Another bonus of replacing the fence is that they'll be able to change the mesh, as the original one didn't have small enough holes to prevent baby mice getting through. I'm not sure how the mice inside will be properly eradicated after that's done. The original eradication was (I think) a brodifacoum drop which would no longer be practical unless everything important was somehow cleared out from inside the fence first.

[–] Dave 1 points 5 months ago

Yeah I saw the mention of baby mice getting through. I'd guess having a fence that keeps them out is the first step, then they could probably reduce numbers with trapping, which may be able to wipe them out eventually. Not sure if there is an issue with say tuatara crawling into mouse traps?