(Texas A&M University) Dogs have been man's best friend for more than 10,000 years, but a new study shows it has been a doggone tough road to get here: their ancestors in the Americas likely came from Siberia, and these early dog populations almost totally disappeared, but not before leaving a cancerous tumor that is still found in their canine descendants today.
from EurekAlert! - Archaeology https://ift.tt/2zcYhlP
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