Biology Bridge Resources


Tutorials/General Content Review

Biology4Kids- Scientific Method and Reasoning in Science

Scientific Method/Experimental Design PowerPoint- reviews major concepts and vocabulary 

Natural Selection- page on Understanding Evolution (UCMP and the National Science Foundation)

Evolution Today- page on the American Museum of Natural History's site, overview of evolution and natural selection




Eastern Gray Squirrel- Study of Northern Virginia Ecology, Fairfax County Public Schools

Eastern Grey Squirrel- BioKids

Gray Squirrel- Adirondack Ecological Center

Eastern Gray Squirrel- North American Mammals (Smithsonian National Museum of Natural History)

Eastern Gray Squirrel- National Geographic Kids

Eastern Gray Squirrel- The Virtual Nature Trail at Penn State

The Urbanization of the Eastern Gray Squirrel in the U.S.- 2013 article in the Journal of American History

Gray Squirrel Biology and Management- Clemson Extension Forestry and Natural Resources

Invasion of the Killer Mutant Squirrels- 2009 article from The Guardian

Squirrel Mapper- discusses the evolution and genetics of squirrel color variation; published by State University of New York College of Environmental Science and Forestry

An Exotic Evolution- 2005 article in the Washington Post discussing black squirrels in Washington D.C.

The Genetic Basis of Melanism in the Gray Squirrel (Sciurus carolinensis)- 2009 article in the Journal of Heredity




Snow Hill High School

305 S Church Street

Snow Hill,  MD 21863   


​Tel: 410-632-5270

Fax: 410-632-5279

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Worcester County Public Schools does not discriminate on the basis of race, color, national origin, sex, disability, or age in its programs and activities and provides equal access to the Boy Scouts and other designated youth groups.The following person has been designated to handle inquiries regarding non-discrimination policies:
Supervisor of Human Resources

Worcester County Board of Education

6270 Worcester Highway, Newark, MD 21841