James M Hartshorne
17 Mar 1956
- RED ROCKS LAKE NAT. WILDLIFE REFUGE
NOTES: Frequency of sound: HIGH; Cover density: OPEN; CONVERSATION NOTES. Sex: 275 UNKNOWNBased on the site, these almost certainly represent Trumpeter Swans, at the time recognized by some authors as C. c. buccinator - CAM - 27 October 2004.