Wednesday, August 26, 2020

Goldfinches

Goldfinches must be the most colourful of all the native finches. I have seen then on most walks this year, first as single pairs in spring and, once their breeding season was over, in flocks, often in the company of linnets.


Immaculate breeding plumage, in spring.
This side view shows the beak well - longer and more pointed that most finches, perfect for wheedling seeds out of teasel heads in autumn

In late spring, dandelion seeds are a favourite meal

That pointed beak is also perfect for extracting seeds from ripe larch cones

And later in the year their diet sometimes switches to oilseed rape seeds


Late summer and the breeding season is over. Often in mixed flocks, with linnets on the Durham coast



Late in the summer, knapweed seeds are favourite food

I often see flocks on up to 200 goldfinches on the Durham coast between Hawthorn Dene and Dawdon,  in early autumn

Saturday, August 22, 2020

heather moorland in August

 The moorlands of Weardale are a sea of purple heather at the moment, often stretching all the way to the horizon. Billions of tiny, nectar-rich flowers are in bloom, feeding vast numbers of insects, from minute thrips to butterflies.



The flowering of the heather coincides with the breeding season of these heather Colletes bees (Colletes succinctus), below. They lay their eggs in tunnels excavated in the sandy moorland soil, usually on a south facing patch of bare ground, then provision the egg with heather pollen before sealing the chamber. They're solitary bees, unlike the highly organised, social nests of honeybees and bumblebees, but do aggregate their nests in huge colonies. Yesterday we must have walked past many thousands of them, congregating at the entrance to their tunnels and shuttling backwards and forwards to the heather flowers.



The vast expanse of flowers also attracts butterflies. Yesterday we saw red admirals, small coppers, small tortoiseshells and small heaths. The small coppers breed on dense, transient patches of sorrel that grows quickly on the bare soil after a heather burn.



This 'woolly bear' caterpillar (below) is the larva of the northern race of the oak eggar moth Lasiocampa quercus. It spends two years in the larval stage, overwintering as a larva before emerging to feed again, then pupating over a second winter before it finally emerges as a spectacular moth.



And finally, a rove beetle Platydracus stercorarius, with wings tightly folded under those red wing cases


Tuesday, August 18, 2020

Bullfinches

The local lanes and footpaths, that I've walked around so many times this year, are good habitat for bullfinches. In spring they feed on buds of cherry plum, sloe and wild cherry in the hedgerows and copses. In summer I more often catch them feeding on the ground, eating dandelion seeds. It's rare to see a solitary bullfinch; the parents and young stay together right through the winter.