Standby, I'll ask them [geese] to squawk!
Don't laugh.. I was 50 miles east of Quebec City, flying a transponder equipped wood and rag plane, inbound at 150 knots, and 5500 feet. The radar controller said to me: "... look off to your right a mile or so, it looks like there is a flock of geese there. There was! There is some high ground between he and my location, and his radar showed them at 50 miles out!