It was backyard detective work that spurred Mimi Olds-Spence, of Auckland, to get active in conservation some months ago.
She noticed that her beloved silk tree was being decimated. Something was eating the flowers and leaves, strewing the ground with fragments and breaking branches – all typical signs of possum browse. Droppings confirmed the culprit. There were other signs too.
We've added several photos from Matt Downer, who has applied his pest detective skills while out walking in the reserves behind Nelson.
On one occasion, when up in Grampian Reserve behind the city, he noticed the possum pellets pictured here. They were easily distinguished by their size, characteristic 'jellybean' shape and greenish tinge.
Just 10 metres away was another very different single larger dropping.
‘Shining a Light on Innovation’ is this year’s theme for the New Zealand Biosecurity Institute’s annual awareness week.
Pest animal detection is one aspect of biosecurity that has seen innovation in recent years. After all, it’s important to know what species are present, where they are and how numerous they are to understand the extent of threat and the success (or not) of pest control.
Our Pest Detective website is one such innovation. It filled a former gap in information and was designed as a search and information tool to help people recognise, through observation, the typical signs pest animals leave in the field and understand each species' typical behaviour.
Did you know that Pest Detective is usable on mobile devices, including phones? No special app is required.
However, Haydn Butler pointed out that he often goes out of cell phone range. He wondered if there is a printed field guide with the same clue information that could be used for people doing pest work in remote areas.
New Zealand’s native wētā droppings can be similar in size and texture to rat droppings but there can be distinguishing features.
As illustrated in this photo recently supplied by Peter Sweetapple, wildlife researcher at Manaaki Whenua – Landcare Research, wētā droppings have blunt ends and often have longitudinal ridging. The ridging can be darker in colour on fresh droppings, resulting in a striped appearance, which fades with time.
Here is compelling evidence of plague skink predation.
The moth is of Family Noctuidae and is probably Graphania mutans (New Zealand cutworm also known as grey-brown cutworm) which is one New Zealand's larger native moth species. A second photograph in our plague skink kill sign section shows the moth remains.
John Stanford, who photographed this animal on the deck at his home in Muriwai, said there are a lot of plague skinks in the area.