https://www.ruffedgrousesociety.org/grouse-facts

By far the major portion of the Ruffed Grouse range and population is in regions where .... pattern for most of this century, in what is often called a "10-year cycle".

https://birdsna.org/Species-Account/bna/species/rufgro/demography

Cyclic fluctuations in harvests of Ruffed Grouse; estimated harvests from .... Marquenski 1986, DHR), but disease has not been causally linked to 10-yr cycle.

http://www.naturenorth.com/winter/grouse/rgrouse2.html

Severe winters with little snow cover are hard on Ruffed Grouse. Disease, weather and predation all play roles in the population cycles of this species. But this is ...

https://northernwilds.com/biologists-puzzled-ruffed-grouse-decline/

Aug 29, 2018 ... Over many decades, wildlife biologists have identified that ruffed grouse populations follow a roughly 10-year population cycle from scarcity to ...

https://www.fieldandstream.com/articles/hunting/birds/2006/10/true-cause-grouse-cycles/

Oct 19, 2006 ... Most upland bird hunters are familiar with the ups and downs of ruffed grouse populations. Such cycles of abundance and scarcity are typical of ...

https://www.outdoornews.com/2018/06/20/whats-happening-to-ruffed-grouse-in-the-upper-great-lakes-states/

Jun 20, 2018 ... Ruffed grouse populations in the past used to fluctuate like a “roller ... What is changing the population cycle has never been known, but ...

https://www.fs.fed.us/database/feis/animals/bird/boum/all.html

Population cycles: In Canada, Alaska, and the Great Lakes states, ruffed grouse populations typically exhibit cycles of increases and declines [104,156], with ...

https://www.allaboutbirds.org/guide/Ruffed_Grouse/overview

In much of their range, Ruffed Grouse populations go through 8-to-11-year cycles of increasing and decreasing numbers. Their cycles can be attributed to the ...

https://bioone.org/journals/The-Wilson-Journal-of-Ornithology/volume-120/issue-2/07-050.1/New-Insight-To-Old-Hypotheses-Ruffed-Grouse-Population-Cycles/10.1676/07-050.1.short

Jun 1, 2008 ... We examined factors hypothesized to influence Ruffed Grouse (Bonasa umbellus ) population cycles by evaluating 13 a priori models that ...

https://en.wikipedia.org/wiki/Ruffed_grouse

The ruffed grouse (Bonasa umbellus) is a medium-sized grouse occurring in forests from the .... The ruffed grouse population has a cycle, and follows the cycle no matter how much or how little hunting there is. The cycle has puzzled scientists ...