Wolf & Moose Populations

Predator and Prey
Moose head closeup with Antlers A wolf in winter in the woods
NPS
NPS



 

Wolf & Moose Populations 1980 to Today

The populations of wolves and moose on Isle Royale constantly adjust as food availability, weather, and seasons affect the health and reproduction of the animals. Over time, notice as the wolf population declines, the moose population increases and vice versa. In the past forty years, Isle Royale has experienced several of these cyclical population relationships.

With the wolf population declines in 2011 and 2014, the wolf population reached unsustainable levels, and the National Park Service is now in the process of reintroducing 20 to 30 wolves from 2018 to 2020.

Year

Number of Wolves

Number of Moose

1980 50 664
1981 30 650
1982 14 700
1983 23 900
1984 24 811
1985 22 1062
1986 20 1025
1987 16 1380
1988 12 1653
1989 11 1397
1990 15 1216
1991 12 1313
1992 12 1600
1993 13 1880
1994 15 1800
1995 16 2400
1996 22 1200
1997 24 500
1998 14 700
1999 25 750
2000 29 850
2001 19 900
2002 17 1000
2003 19 900
2004 29 750
2005 30 540
2006 30 385
2007 21 450
2008 23 650
2009 24 530
2010 19 510
2011 16 515
2012 9 750
2013 8 975
2014 9 1050
2015 3 1250
2016 2 1300
2017 2 1600
2018 2 1500
 

Isle Royale Wolf & Moose Population Graph 1980 to Today

 
Graph of Wolf and Moose Populations of Isle Royale 1980 to Today

NPS

Last updated: September 20, 2018

Contact the Park

Mailing Address:

800 East Lakeshore Drive
Houghton, MI 49931

Phone:

(906) 482-0984

Contact Us