Speciation: Of Ligers & Men - Crash Course Biology #15

Hank explains speciation - the evolutionary process by which new biological species arise - in terms of finches, ligers, mules, and dogs. Table of Contents 1) Species 0:30 2) Hybrids 1:52 3) Reproductive Isolation 2:48 a) Post-Zygotic 3:31 b) Pre-Zygotic 3:51 4) Allopatric Speciation 4:23 5) Sympatric Speciation 6:03 6) Biolography 6:32 7) Dogs 8:37 This video contains the following sounds from Freesound.org: "bird tweet.aif" by tigersound "ForestBirds.wav" by HerbertBoland "morning_in_the_forest_2007_04_15.wav" by reinsamba "AMBIENT LOOP - Perfectly Clear - Wilderness Hillside - FILTERED.mp3" by Arctura "oceanwavescrushing.wav" by Luftrum Crash Course is on Patreon! You can support us directly by signing up at http://www.patreon.com/crashcourse Want to find Crash Course elsewhere on the internet? Facebook - http://www.facebook.com/YouTubeCrashCourse Twitter - http://www.twitter.com/TheCrashCourse Instagram - https://www.instagram.com/thecrashcourse/ CC Kids: http://www.youtube.com/crashcoursekids