Penguins at London zoo test out a new diving board, installed in their enclosure today.
Keepers say that they are trying to get the birds into the Olympic spirit ahead of the London games.
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The latest poll for ITV London and LBC shows Sadiq Khan leads Zac Goldsmith by 45% to 36% on first preference votes.
Corbyn was unveiling a poster less than a mile away as Khan gave his final campaign speech to party supporters in London.
Hay fever is an allergic reaction to airbourne pollen. There are 2 million sufferers in London (that's one in 5 people).