AP Blue Sky Science: Why do some animals go extinct while other species regenerate? May 15, 2019 0 Facebook Twitter SMS Email Print Save Some species are simply more rare than others and don’t occur in very large numbers. But usually there is some factor that has driven a population to even greater rarity. Tags Wire Field59 Blue-sky-science More video Project Lab: Making a 3D printed sign Blue Sky Science: Why do butterflies stay in a cocoon and for how long? Meet Australia's craziest drinking tradition Facebook Twitter SMS Email Print Save Load comments × Post a comment as Emoticons [smile] [beam] [wink] [sad] [cool] [innocent] [rolleyes] [whistling] [lol] [huh] [tongue] [love] [sleeping] [yawn] [unsure] [angry] [blink] [crying] [ohmy] [scared] [sleep] [sneaky] [tongue_smile] [thumbdown] [thumbup] [censored] [happybirthday] [ban] [spam] [offtopic] [batman] [ninja] [pirate] [alien] Comment Text Cancel Post comment × Your comment has been submitted. × Report Cancel Report Abuse ×Reported ×There was a problem reporting this. × Watch this discussion. Stop watching this discussion. Watch this discussion Get an email notification whenever someone contributes to the discussion Notifications from this discussion will be disabled. Cancel Start watching Stop watching (0) comments Welcome to the discussion. Log In Keep it Clean. Please avoid obscene, vulgar, lewd, racist or sexually-oriented language. PLEASE TURN OFF YOUR CAPS LOCK. Don't Threaten. Threats of harming another person will not be tolerated. Be Truthful. Don't knowingly lie about anyone or anything. Be Nice. No racism, sexism or any sort of -ism that is degrading to another person. Be Proactive. Use the 'Report' link on each comment to let us know of abusive posts. Share with Us. We'd love to hear eyewitness accounts, the history behind an article. Post a comment Watch this discussion. Stop watching this discussion. Most Popular 1 man dead, 1 in custody after shooting in Mattoon Charleston man charged with drug-induced homicide Charleston School District moving to competency-based education Mattoon School administration getting personnel shakeup Charleston woman pleads guilty to causing child's death View All Promotions promotion Research decades of articles the easy way! promotion Looking for something different? Try our special sections!