A mother has been accused of locking her three-year-old son in conditions 'not fit for an animal' for 22 hours a day.

Investigators discovered the toddler lying naked on a bed surrounded by flies and covered with urine. 

The walls of his room and bed were covered with feces as he had no access to a toilet.

One witness told police they would hear the boy banging on the walls and screaming for food.

'The child was locked in anywhere from 20 to 22 hours a day with very little, was never allowed out to use the bathroom, had to survive by himself, was brought out once a day for one meal, one big meal.'