Study: Hamsters have moods, too

https://www.usatoday.com/story/news/2015/07/28/hamster-mood-angry-study/30803989/?fbclid=IwAR0h7yDg48P-GSnukaNzCL2FYyYinnuNt9G36eJVq_AtkZSgRQH6PFHJZuw