David Muir has the story of the 5-week-old pygmy hippo who refused to leave the pool on a hot summer day, until his mother Posie came over and gave a look that many know all too well. ––– Subscribe to ABC News on YouTube: https://abcnews.visitlink.me/59aJ1G ABC News is your daily source of breaking national and world news, exclusive interviews and 24/7 live streaming coverage. Download the ABC News app for the latest headlines and alerts: https://abcnews.go.com/devices Watch 24/7 coverage of