24 April 2015

Same nest, different tenants - squatter's rights for birds!



Everyone know it’s good to recycle or if possible re-use, but it’s not just us that does this.Two summers ago we noticed Swallows taking a great deal of interest in the toilet block at the volunteer centre here at High Wray. We always keep the door shut, to stop them flying in and getting stuck, but in this instance they were interested in the alcove above the door – an ideal nesting spot it would appear. Over the course of a couple of weeks we watched the nests build up, with both adults bringing in mud and plant material to make a lovely firm construction.

Soon after completion we were delighted to spot the female sat on the nest. We were worried at first that she’d be put off by people heading in and out of the loo, but she’d briefly exit the nest whenever anyone passed before quickly returning. A couple of weeks later we noticed she was exiting the nest a little more often and spotted tiny fluffly feathers poking out over the rim of the nest – they’d hatched!


Young and virtually featherless, the young not long hatched
It took about another 3 weeks for them to steadily grow to the point where they were hanging out over the sides and it seemed a wonder they didn’t force each other out of the nest! Shortly after that, we checked one morning to find they’d all gone (without so much as a thank you).

Shove over! The considerably bigger young almost ready to go

The next year we hoped they would return as Swallows will often repair and re-use old nests, but were disappointed to see no sign of action. By the end of the summer the nest above the gents loo door was starting to look very run down, with the ladies one holding together much better.

New tenants move in!

So we had our fingers crossed for this year but it looks like someone beat the swallows to it. It appears that a Wren has decided the ‘ladies  nest’ would make a perfect base for its own construction and has built an exquisite (and very snug looking) extra layer on top of the original base. It looks like it had a go at the ‘gents nest’ as well, judging by the tatters of moss poked into some of the holes, but obviously agreed with us on the state of it and must have given it up as too much hard work.

The 'gents nest' - not sure about that .....

Much better! The 'Ladies nest' with cosy adaptation

We’re not sure if this adapted nest has ended up being chosen by the female Wren (males normally build several nests, from which the females chose their favourite), but we’ll keep an eye on it over the coming weeks. One things for sure, with the swallows having just reappeared on the scene here (see last week’s entry on migration) they’re likely to get a big surprise if they decide to return to this particular site!

By Rob Clarke, High Wray Basecamp community ranger

17 April 2015

The Great British Migration

Spring is finally here. As most of us contemplate what and where we are going on our summer holidays this year, the mass summer migration has begun for Britain’s wildlife.

Could you imagine having to travel half way around the world to get to your destination, only to then repeat the same journey four months later? No nor can I but that’s exactly what hundreds of millions of our summer migrants do every year.

Birds

 

Bird species such as Wood Warbler, Redstart, Cuckoo (arrive early April and leave by end of June) Swallow, House Martin, Sand Martin, and Swift (last to arrive and first to go) arrive in the spring and have traveled for thousands of miles from either North-West or Sub-Saharan Africa. These species come to Britain to breed because the further North they go, the greater the abundance of food and more light in which to search for it.

Wood Warbler
Redstart
Cuckoo
Swallow
Sand Martin
House Martin

Butterflies & Moths

 

Would you believe that some of our butterflies and day flying moths migrate to the UK too?

Take the Painted Lady for instance; this migrates from North Africa, the Middle East and Central Asia, which is somewhere in the region of 9000 miles and at altitudes of over 1,000m.

For a tiny creature weighing less than a gram, with a brain the size of a pin head, and no opportunity to learn from older, experienced individuals, undertake an epic journey. It’s estimated that 11 million arrive in Britain each year, with around 25 million migrating back by the end of the summer.





The Red Admiral like the Painted Lady is another migrant to Britain, flying from North Africa and Continental Europe in there millions and covering similar distances as their counterparts.



The Humming-Bird Hawkmoth is a day flying moth that also migrants to Britain. These arrive in there thousands every year. Historically these were usually frequenting the South and East of the Country, However due to changes in our climate and hence warmer summers; they are being seen in Cumbria in larger numbers.



The Silver Y moth is our most common immigrant moth from Southern Europe, North Africa and parts of South East Asia, which can arrive in numbers up to 250 million in a good year (yes that’s correct you read it right!), with a staggering four times as many leaving as arrived.



10 April 2015

Neolithic axe factory.



The Borrowdale Volcanic Group underlies the highest and craggiest central part of the Lake District including the Langdale and Scarfell Pikes. These igneous rocks are volcanic lavas and ash flows erupted during a phase of cataclysmic volcanism 450 million years ago. Ash exploded out of a volcano, may fall through the air and settle in beds, when compacted and cemented these are called tuffs. 

The fine grain tuff located in a band of outcrop rock which extends around the summits of Langdale, Bow Fell, Scafell and Glaramara is the source of material for the Langdale axe production sites. This band has been eroded by glacial action and detached blocks of the tuffs are present within the morainal mounds and scree slopes below.

The majority of axe production sites were directly associated with the outcropping of this source material on either the face of Pike of Stickle and Harrison Stickle or the South scree gully. Debris and hundreds of "reject" axes have been found on the scree slopes of Pike o' Stickle.

Pike of Stickle and scree gully.

The initial identification of axe production in the Langdale area was on Mart Crag Moor between Stake pass and Pike of Stickle. 

Below is a more resent discovery in 2008 on the moraines on Mart Crag Moor. A footpath over Mart Crag Moor had formed a large erosion scar due to inadequate drainage. Consequently this exposed a previously unknown Neolithic axe manufacturing site.

Mart Crag Moor axe production site.
                          
The Neolithic axe factory Sites in the Langdales and Scarfell are where the rough outs of axes were manufactured. There is evidence that sandstone grinding slabs found on the Cumbrian coast were used to polish or finish these greenstone axes. 

Polishing the rough surfaces will have improved the mechanical strength of the axe as well as lowering friction when used against wood. Of all the Neolithic polished stone axes that have been examined in the UK, around 27% come from the Langdale region. 

Neolithic axe factory sites of Langdale and Scarfell Pike in Cumbrian, together with Grimes Grave in Norfolk represent the earliest industry of true mass production in Britain.

Polished greenstone hand axe, found at Troutbeck Bridge, 1899