It's a National Geographic staff member's worst nightmare: there you are on location, studying the mating habits of wild animals when — gasp! — you're spotted, exposed on the open plain.
Luckily, when this happened to Paul Rose and his cameraman, the fearsome foe was a giant tortoise, who charged the enemy: veeeeeeeeery sloowwwwwwly.
The video clip, uploaded by National Geographic, shows the male giant tortoise turn to the interlopers and pursue them out of his territory. And just as in Aesop's fable, he can't get a great deal of speed up.
He can, however, keep coming relentlessly, slow and steady - pursuing Rose for 400 yards "with this whopping great tortoise determined to take a lump out of my leg" as Rose says.
His cameraman, meanwhile has the right idea- when he's told "don't move", he replies: "Don't move my [beep]!"
Clever man, that. After all, back in 2013, two mating tortoises managed to literally burn the house down in England.