theanimalblog:

by: macaroni-andcheese
scientificillustration:

Male Genitalia of the guinea pig and Brown rat by BioDivLibrary on Flickr.
Annales des sciences naturelles :.Paris :Crochard.biodiversitylibrary.org/page/5756017
n-a-s-a:

Dark Markings of the Sky 
Credit & Copyright: Steve Cannistra 
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