Do birds let ants go on them to control pests?

Yes, some bird species do allow ants to crawl on them as a form of pest control. This behavior is particularly observed in species like the European starling and certain woodpeckers, which may utilize the ants to help remove parasites from their feathers or skin. The ants can provide a cleaning service by feeding on these pests, benefiting both the birds and the ants in a mutually advantageous relationship.