Image: F1 wolf-dog hybrids from Wildlife Park Kadzidlowo, Poland

Description: First-generation (F1) wolf-dog hybrids from Wildlife Park Kadzidlowo, Poland: female wolf×male Polish Spaniel (left); female wolf×West Siberian Laika (right) (photos: A. Krzywinski). doi:10.1371/journal.pone.0046465
Title: F1 wolf-dog hybrids from Wildlife Park Kadzidlowo, Poland
Credit: PLOS ONE
Author: Maris Hindrikson et al
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