A Denver man and woman have been charged with child abuse after their four children were found malnourished and living in unsanitary conditions.

Wayne Sperling, 66, and Lorinda Bailey, 35, have each been charged with four counts of felony child abuse, according to a news release from the Denver District Attorney’s office.

The children, ages 2, 4, 5 and 6, were allegedly living in an unsanitary conditions, where they were mistreated. According to court papers quoted by 9News, the floor beneath the children’s bed was covered by a layer of cat droppings.

Investigators say that the children were malnourished when they were found and were nonverbal, communicating with sounds like infants. None of the children were toilet trained.

All four children have been placed in protective care.

Sperling and Bailey remain in custody. Their bond has been set at $5,000 each.

The two are scheduled to appear at 9:30 a.m. on Tuesday in Denver County courtroom 2100 to be formally advised of the charges against them.