Whimbrels are large shorebirds with long legs, necks and long decurved bills, they are streaky and buffy with a light stripe in their crowns.
This Whimbrel wasn't reacting to my presence when it exhibited this threat display instead it was reacting to the presence of two other Whimbrels that are outside of the frame.
When I lived in Florida I was able to see and photograph two of our largest North American shorebirds during winter which are Whimbrels and Long-billed Curlews.
Among the shorebirds I enjoyed seeing and photographing while I lived in Florida were Whimbrels, I could see flocks of 25 or more during the winter along the coast.
It didn't take long for me to check my ISO, my aperture and other techs as I dropped onto my knees before laying flat on my belly to photograph the flock of 20 or so Whimbrels.