The residents benefit simply from having the animals around, too. "[The birds] have got such a therapeutical effect on you so it's brilliant," said one of the inmates working on the project. "It puts more light into every day."
Jarvis hopes to expand the project in future -- for example, by selling the eggs through the prison's visitors' center.
This isn't the only instance of animals helping out prison inmates (besides, of course, Alcatraz's famous "Birdman"). Sometimes, inmates take it upon themselves to care for animal passersby, says the Guardian:
When staff at Oakwood Forensic Centre, a maximum security prison for the criminally insane in Lima, Ohio, noticed that prisoners on one ward were suddenly being far more sociable and cooperative than usual, they investigated. They discovered that the inmates had found a sick sparrow in the prison yard and, working together, had secretly nursed it back to health.
Another prison in New Orleans runs an aquaculture program using a rooftop and the security guards' former football field for its site, producing tilapia that is served on the menu twice a month. Inmates learn technical fish farming skills, along with nutritional insights.