Sunday, 24 September 2017

A Sad Post about Hedgehogs

A marked hog (the red spines are nail varnish) we got from a rescue centre to over-winter, back in 2013.



 Some of the lists I made of sightings.

In hoggier times.

Those of you who've followed this blog for years might remember a lot of posts about hedgehogs. A few years back I realised there were hogs in my garden, so I started to monitor them using a trail cam. If I came across a hog in the flesh, I'd take it inside for weighing, sexing and marking-as-approved-by-the-BHPS. (That meant a little bit of white enamel model paint applied to the tips of the spines only.) By this method I was able to keep tabs on numbers. What I discovered was that we had over twenty individuals visiting over the course of the year. Some nights there'd be as many as seven in the garden at once.

I began to speak to neighbours about it, and found out they were seeing hogs too, and the animals were going up and down the length of the street. People would call out to me, 'We had one of your hedgehogs on our patio last night!' I leafleted houses nearby, explaining how to help hedgehogs and what kind of things were dangerous to them. For the four years I kept tabs, it was a busy, thriving hog community.

Then, at the start of 2016, I found on the lane behind my house a dead hog that had been hollowed out. Only the skin and spines remained. This individual had been on camera only four hours before, so it hadn't lain around and been eaten by scavengers over time. Whatever had killed the hog had scooped the flesh out in one go. The only predator I knew that killed hedgehogs this way was the badger. 

Over the next couple of months, hog sightings on my trail cam dropped right off, until at what's normally a peak time for numbers, July/August, just one was visiting the garden. Then in early autumn, my next door neighbour called to say there was a hedgehog sleeping in his compost heap and it might be in trouble. I went round to see, and when we turned the animal over it again had been scooped out leaving just the spines. Dismayed, he showed me where 'something big and strong' had pushed apart his wood pile in the night to gain access to the garden. I was wondering if a dog might have done it, but they don't hollow out hedgehogs that way.

Two days later another neighbour from across the road messaged me to say she'd come back from an extended stay abroad and found her garden had been taken over by badgers.

We haven't seen a single hedgehog since. Someone at the far end of the road reported a nesting one at the beginning of the year, and we all got hopeful, but it quickly disappeared. There are just no hedgehogs here any more. The entire community has vanished.

I'm aware this will not be a popular post at a time when badgers are politically vulnerable. But as an ecologist, albeit an amateur one, I have to report a true observation. I know it's mainly environmental threats that have brought hedgehog numbers to desperately low levels; however, when a species becomes so vulnerable, then even native predators can become a critical threat. 

I believe it's an issue we have to address if we're going to save hedgehogs from extinction.

Sunday, 17 September 2017

Appropriate Management of Banks








The Environment Agency have been strimming the banks as they usually do in autumn, using what I'm pretty sure is an 'M cut' where you leave a good fringe of cover next to the water's edge. This is vole-friendly maintenance. A few years back, the EA very kindly came out and chatted with the Whitchurch Water Vole Group about what was best for both flood management and wildlife, and have consulted us ever since.

I was delighted to get three sightings at White Lion Meadow today. There are certainly quite a lot of droppings about, showing that voles are active there.

Saturday, 16 September 2017

Wednesday, 6 September 2017

September Voles

Bank vole





The water vole activity remains stubbornly nocturnal, though there've been no more otter sightings or particular signs of other predators. Video footage shows the colony's as busy as ever.

Meanwhile this dead bank vole was left on our drive by a cat, and I post the photo because it's useful to get a really good close look at the features which make it identifiable. Nose blunt and ears small = vole, no question. But it's too small for a water vole, which means (on mainland UK) either bank-vole or field-vole. So then you check the tail and here it's just over 50% of body length, which makes it definitely bank vole; in field voles the tail is much shorter. In fact sometimes field voles are called 'short-tailed voles'. There are subtle differences in fur colour and texture too, with bank voles being a little redder than their greyish cousins. Tail's the main identifying factor, though.

Monday, 28 August 2017

The Relative Sizes of Riparian Mammals





Otter Bottom


video



video

A surprise last night: this flash of full-grown adult otter disappearing upstream. I've seen otters before here, in Sept 2014 (previous otters) and twice over the years found their spraint, but I don't believe they use this tiny stream as anything other than a corridor. It's barely deep enough for an otter to paddle in, and only about two-otters-wide. Otters will take water voles but are too big to fit down the burrows in pursuit, so I'm hoping my little team will stay safe.

I've no idea whether this is related to the change in my voles' routines!

Saturday, 26 August 2017

Nesting


video


video

I'm getting nightly sightings but still nothing in the day. It was lovely to capture footage of this nesting vole, though. I've seen voles gathering bedding before, but never managed to catch it on camera. Not sure whether this is a female getting ready for a litter, or whether voles of both sexes gather material this way. Does anyone know?

Edited: yes, Derek Gow, patron saint of water voles does. He says: "Both sexes are perfectly capable of building nests. Males underground tend to avoid females as they are pretty belligerent. We don't know if the males play a direct role in rearing young but they are tolerant of them." So this vole in the video clip could be male or female.