NPSpecies

A casual winter visitor to the Colorado River. Two Trumpeter Swans spent parts of three winters along the Colorado River between RM 4 and RM 20.5. First seen on 14 Feb 1997 (Lawrence E. Stevens), they stayed through at least 10 Mar 1997 (Dan Hall). They were seen again on 12 Jan 1998 (John R. Spence, Nikolle L. Brown, Kristin M. Enos, et al.), and from 4 Jan 1999 (Lawrence E. Stevens) through 22 Jan 1999 (Robert G. Bramblett). These marked birds were traced to a transplanted population in Wyoming which was established to restore their numbers there (LaRue et al. 2001).

(Cygnus buccinator) Trumpeter Swan is a casual winter visitor to the Colorado River. Two Trumpeter Swans spent parts of three winters along the Colorado River between RM 4 and RM 20.5. First seen on 14 Feb 1997 (Lawrence E. Stevens), they stayed through at least 10 Mar 1997 (Dan Hall). They were seen again on 12 Jan 1998 (John R. Spence, Nikolle L. Brown, Kristin M. Enos, et al.), and from 4 Jan 1999 (Lawrence E. Stevens) through 22 Jan 1999 (Robert G. Bramblett). These marked birds were traced to a transplanted population in Wyoming which was established to restore their numbers there (LaRue et al. 2001).