This is the remarkable moment a family of ducks chase down an alligator on the ninth hole during a charity golf tournament in South Florida in May.

The unusual sight was captured by Ryan Witkowski, who was playing in the tournament and was driving towards the hole when he noticed the ducks not only chasing after but also honking at the alligator.

"Look at this! Oh my god! (Hole) number nine! PGA National!" says an incredulous Witkowski in the video.

Another man can be heard saying in the background: "These birds (are) super-aggressive when they've got young ones" as the ducks get closer to the gator.

Some online commenters had thought the birds were geese but it is more likely that they are mallards, a type of duck with distinctive black feathers on their tails, as seen here.

The funny incident was captured during Christie's Critters charity golf tournament at Palm Beach Garden's PGA National Resort Champion Course, where the Honda Classic pro tournament is played.

But it's unlikely that gators were the type of critters that the organisers had in mind!

I was playing golf charity tournament in the Christy’s Critter tournament on May 6. PGA National champion course, where the Honda Classic is played. 9th hole.