Thylacines, blocked noses and bird flu

How different would the environment be if the thylacine wasn't wiped out? Are animal sightings symbolic? And why do bower birds collect blue items? Dr Karl and Deadly Science's Corey Tutt answer these questions and more on triple j Mornings with Lucy Smith. Got a question for Dr Karl - submit it here https://ab.co/askKarl Follow Deadly Science here:  https://www.instagram.com/deadlyscienceorg/?hl=en