Squabbling Mice

"These tube mice are born and spend their whole lives without ever even seeing the Sun or feeling a blade of grass. On one level, it's a desperate situation - running along gloomy passages for a few months, maybe a year or two, and then dying. And because there are so many mice and so few resources, they have to fight over something as irrelevant as a crumb." 

Wildlife Photographer of the Year, Sam Rowley: https://www.bbc.com/news/science-environment-51465064