The ruru (morepork) is a predator – but it’s certainly not on the ‘predator-free’ hit list. Those slots are just for introduced mammal predators which haven’t co-evolved with our vulnerable native species. Ruru do prey on other native wildlife however, including endangered species, as a recent study … [Read more...] about Video camera study reveals rare birds in ruru diet
If you park up at the beach with a feed of fish and chips it can seem like red-billed gulls are common and thriving. But 52 years’ worth of observations and monitoring data from New Zealand’s biggest gull breeding colony on the Kaikoura Peninsula tells a somewhat different story. Mammal predators … [Read more...] about Kaikoura red-billed gull study reveals predator impacts over 52 years
Approximately one-third of New Zealand’s islands are now free of all invasive mammals. Could Auckland Island be next? Predator control and eradication operations are often carried out in winter – when predators are hungry and uptake of bait likely to be greater. But when it comes to … [Read more...] about Would summer eradication of rodents work for Auckland Island?
Dual 1080 operations - would two toxin applications a few weeks apart work better than one? Possibly, if a few other conditions are also met. Currently, aerial 1080 drops are used to control introduced predators, but not expected to totally eliminate them. Aerial 1080 application is used to knock … [Read more...] about Dual 1080 application could be key to possum and rat eradication
Trappers from the Kepler Challenge Trust helped out by supplying 248 trapped ship rats back in 2009-2010, so that researchers Kay Clapperton, Fraser Maddigan, Warren Chinn and Elaine Murphy could carry out a detailed study of what the Fiordland ship rats had been eating before they died, the … [Read more...] about Life of plenty for beech forest ship rats
Up until the 1950s, most pest control toxins for vertebrates, including rats, were fast-acting. While a quick death for pests is a good thing humane-wise, the issue was, rats didn’t necessarily die. They’d try a little toxin, quickly feel the effects and sensibly refuse to have anything more to do … [Read more...] about New toxin combination tested for rats and possums
When scientists studying the dynamics of a Norway rat colony in New York had some wild cats moved in on the experiment, they took the opportunity to see how the presence of cats and their behaviour influenced the presence and behaviour of the rats. Did rats move out when the cats moved in – or did … [Read more...] about Can feral cats limit rats?
‘Giant rats’ in our cities have hit the media headlines in recent weeks and, while ‘rats as big as cats’ are unlikely to be stalking the suburbs, there do seem to be some large and well-fed rats lurking in urban areas. What’s more – the rats that your cat brings home may not be the biggest ones out … [Read more...] about Cats vs Rats (and the big ones that get away)
Thermal squeeze: it’s what happens when temperatures rise, predators spread out to higher altitudes and their vulnerable prey species are squeezed into less-than-ideal pocket habitats at the outside edges of their range. Large, cavity-nesting birds may be particularly vulnerable to thermal … [Read more...] about Thermal squeeze could put pressure on native wildlife
A 22-year study in Tongariro Forest has followed 142 radio-tagged North Island brown kiwi through 4 landscape-scale aerial 1080 operations, covering an area of 20,000 hectares. Not only did all 142 kiwi survive the 1080 drops, but the long-term study reveals a swag of other interesting information … [Read more...] about Long-range study follows kiwi for 22 years