At first glance, the tree looks unusually dense, as if it's overflowing with thick green leaves. But in several London neighborhoods, this striking sight has nothing to do with foliage. As night falls, these trees are not filled with leaves at all — they are completely covered in ring-necked parakeets. As the sun sets, the birds gather in massive numbers, settling into the … [Read more...] about This London tree looks full of leaves — but it’s actually alive with thousands of parakeets