We speed off in zodiac inflatable boats, and watch in silence from barely 50 yards away as the apex predator ambles along with lazy, powerful strides.

For instance, on some occasions I can just tell they're watching, other times it's like they're reaching out and I run to my car and speed off and still don't feel safe even after I get home.

Cyclists jump on and off pavements and ride at speed along the pavements.