image: Nina Vasilieva is with yellow ground squirrel baby. This material relates to a paper that appeared in the Oct. 2 2015, issue of Science, published by AAAS. The paper, by N. Vasilieva at Russian Academy of Sciences in Moscow, Russia, and colleagues was titled, "A shortage of males causes female reproductive failure in yellow ground squirrels." view more
Credit: [Credit: Photographer: Vera Matrosova]