Monkey Day Care and the Little Albert Experiment (2015)

I'd bet it was a normal daycare.

I'd guess it was the "Klemmer Farmhouse Co-op Daycare".

If it was legal to have pet monkeys in 1981 then I'd guess there was monkey or two and it was a pet and might have come and gone at the daycare as that parent volunteered at the co-op.

The flyer and paperwork was about joining the co-op.

If the father was studying or lecturing at the university then this would change my guess. But if that was the case I'd say the author would mention it, which they don't.

The multiple years, the regular days, the rough legs from play, walking in a door, all imply normal daycare with other children. A study that size would be to big to not write up in multiple papers and kids learning with primates makes mainstream news. People publishing in 1981 still are at the university today, it'd be remembered.