camp ripley and arden hills minnesota army national guard training ...

2004-2006 and more than were heard from 1993-1999 (Figure 30). One northern saw-whet owl
(Aegolius acadicus) was heard on route #1 in 2009. Fewer barred owls were heard on Route #2 this
year than in 2004-2006, but similar to 2007 (Figure 31). No great horned owls (Bubo virginianus),
where heard in 2007 and 2009 on route #2.
Number
Number
25
20
15
10
5
0
14
12
10
8
6
4
2
0
Figure 30. Owl numbers from route #1, April 1-15
survey, Camp Ripley, 1993-2009 a .
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2004
2005
a 1993- 2006 survey conducted with three minute passive listening period and 2007-2009 survey
conducted with five minute passive listening period.
2006
2007
Page 49
2008
2009
Barred owl
Great horned owl
Northern saw-whet owl
Eastern screech owl
Figure 31. Owl numbers from route #2, April 1-15
survey, Camp Ripley, 2004-2009 a .
Barred owl
Great horned owl
2009 Conservation Program Report