My grandfather had a springer spaniel/ black lab mix that would snatch birds out of the air.
There was a section out in the woods behind his house that had swale grass about 4ft tall.
I used to walk him out there periodically. He would used to hop through the grass. Disappear, then hop again. Head popping up over the top of the grass. Then you would hear a partridge take off. Just as the partridge cleared the top of the grass, you would see the dogs head pop out of the grass and snatch the bird.
He used to remind me of a shark