Richard Smith, 64, was cycling through the UK one day, riding along the River Thames.
While enjoying his bike ride, he spotted something in the river that caught his eye.
"I was cycling on my own and I saw what I thought was a bough of a tree with four stubby branches on it close to the bank. As I got closer I saw it was a crocodile. It was about 4ft long. It had a 2ft tail and 2ft body. I got off my bike and ran back to where it was, but it had gone. I ran along the river for about 50 yards, but it wasn't there any more."
He originally saw the "crocodile" in June but didn't say anything until he heard a tackle shop worker mention he too saw a crocodile.
"The man in the shop said he was on the bank of the Thames near Tilehurst station and he saw a fully grown swan pulled down into the water and it totally disappeared. I don't think the crocodile that I saw would be big enough to be very dangerous, but I can imagine in time there might be reports of dogs swimming in the river being caught by it."
The crocodile, even though it's not huge, could still pose a threat if people don't expect it to be there.
Experts say a croc would have trouble surviving and English winter, so we'd be surprised if they're still hanging around.
But if you live near the Thames, maybe keep your dog on the leash. Just in case.
[Image via Tomás Castelazo/Wikimedia Commons.]