Saturday 04 July
It’s been almost autumnal today. If it wasn’t for the 19°c temperature, the wind and drizzle-ready grey skies created a backdrop more like November.
Me and Stan have been chatting about evolution during our walks. I confess that I have not read up enough of the science behind this. I tend to spend most of my time thinking about the clear common-sense of it all; whilst also finding it difficult to comprehend the mind-mushing fantastical magic of it.
He explained very clearly how species survive through genetical anomalies which, accidentally I guess, ensure a species thrives. Those that plod along, following their standard genetic code, can (if threatened) eventually get wiped out. All evolutionary change is driven by a single need – to survive.
Let’s take the Great Spotted Woodpecker as an example. As a species it has evolved a unique skull composition. It’s a spongy, softer material that means that the rapid, hammering of the bill against the tree trunk doesn’t damage the brain. It’s very long tongue not only allows it to seek out insects from inside bark crevises; it is also ‘wrapped’ around the skull to provide even more padding to absorb wood-pecking shock.
The reason for this adaptation? To get the juiciest insects, to attract the best mate, to build the safest nest? Well, all of the above really.
The red patch at the back of the head distinguishes the male from the female. Yet another handy adaptation, I guess. A genetic mutation that possibly occurred once, proved successful in attracting a mate, and in turn, got passed on generationally. And on, and on. Possibly to the detriment of the males with no red patch?
More on genetics and evolution to come. I love doing this blog, I am learning so much from my kids!
The Bald Birder 