London's exhibit *
is* pretty good...... but it doesn't hold a candle to the one at Edinburgh, which (as already noted by
@Quincey ) is the largest outdoor penguin exhibit in Europe and - although this was not specified in the aforementioned post - I am pretty sure the main pool is
also the deepest in Europe. As a result, the inhabitants of the exhibit have a lot of space within which to move around, and it is one of only two or three penguin exhibits where I have seen displays of prolonged porpoising due to the length and depth of the main pool. Add this to the breeding record of all three species within the collection (historical in the case of the King Penguins, as Edinburgh - the studbook holder for the species - refocused into keeping a batchelor group a few years ago) and the fact that the cool hillside location of the exhibit is highly-beneficial to the health of the inhabitants, providing some protection against the aforementioned increasing risk of avian malaria, and I think this exhibit not only deserves to win the title of the best penguin exhibit in the UK, but also the best in Europe.
A few photographs to better illustrate the exhibit:
There seem to be no images of the massive underwater viewing window situated downhill from the exhibit, so after I have finished work I will root through my own photos to see what I can add.
For now, this google maps shot shows the scale of the exhibit:
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