Dave Andrews couldn't believe what he was seeing. And then he couldn't believe what he was tweeting.
"Can't believe I'm writing this, no joke - BELUGA in the Thames off Coalhouse Fort," the Norfolk, England, resident posted on Twitter Tuesday.
The ecologist and ornithologist, as described on his Twitter account, had spotted a beluga whale swimming in the River Thames east of London, far from its normal habitat.
A beluga swimming in the Thames is undoubtedly rare, and a social media frenzy ensued.