A solution might be found under wet leaves on a forest floor, recent research suggests. (sciencenews.org)
Simply wet the leaves, place them on a tray and allow your birds to run through the leaves or roll around in them. (thesprucepets.com)
There is a gentle wind that shakes the darling leaves of my cucumber plant, wet leaves already bigger than my husbands warm palms. (willfrolicforfood.com)