A great deal of speculation has been going on for some time in the scientific and lay media as to the timing and impact of a 2% increase in global temperatures, and this year seems to bear out the possibility that, whether by natural or human intervention, there is a blip in the weather patterns around the British isles and continental Europe.
Human beings, with their relatively short life span, find it hard to imagine that only 18,000 years ago the British Isles were part of an extended European land mass, brought about when the most recent Ice Age locked up a vast amount of water and the world’s oceans were considerably lower than they are today. A polar ice cap several kilometers thick extended as far south as the Midlands The mechanism for this phenomenon is thought to be a change in the earth’s rotation and as a consequence a reduction of the heat output from our sun. During this time there were incredible changes in the natural world with animals and birds in the northern hemisphere adapting to the intense cold periods, some of which lasted for several million years. The last Ice Age was not one event, but several events interspersed with warm, almost tropical periods. Technically we are currently in one of these warmer periods with another Ice Age in the distant future … if the pattern holds true.
It was during one of these climatic upheavals that our own species evolved and ever since we have been changing the planet to suit our own needs, especially over the last two or three hundred years.
Great White Egret
The event that brought about this train of thought was a bit of birdwatching at Summer Lees Nature Reserve on the Nene Valley in Northamptonshire. I had arranged to meet up with a close friend to see what the unusually wet weather had brought in to the flooded gravel workings. We had just settled down in one of the many hides when a large white bird flew across an area of open water and dropped down behind a reed bed. I only got a glimpse, but was pretty sure that it was a great white egret, confirmed a few minutes later when a little egret flew past. Both of these birds were rarities in the latter part of the 20th century, but as climate change began to kick in the little egret in particular began to colonize the southern part of England from its stronghold in France.
The little egret is pure white with black legs finished incongruously with yellow feet that look rather like a pair of rubber washing up gloves. The great white egret, about the same size as our common grey heron, also has black legs, but black feet and in the breeding season the top of the leg takes on a yellowish/red colour.
Like the little egret, the great white egret is a European bird of lakes and marshes. They have popped up uncommonly from time to time in southern Britain and East Anglia as spring and summer passing visitors to the delight of the twitching fraternity, but during the past 5 years their appearances have become more frequent and they have begun to turn up in late autumn at certain nature reserves and lake sides showing every sign that they are not just visitors, but might fancy staying on; particularly if an egret of the opposite sex should happen to pass by.
I have watched these beautiful birds in various parts of Europe, but only occasionally in Britain.
The bird at summer Lees obligingly decided to walk sedately out of the reeds affording me with a brilliant view and allowing for no doubt as to the species. Later in the day it was joined by another great white egret, possibly a female as it was a little larger… and the whole point about changes in our bird fauna due to alterations in the British climate took on quite a different perspective. Hopefully, like their smaller cousins, they will begin to colonize here. It would be a bonus and one of the unrealized benefits of changes in our weather that might make us more aware of the value of nature