Refill the bottle daily (a 1.5-litre bottle lasts six to eight hours at one drop per second). Clean the bath every three days — more visitors means more fouling. In winter, the drip delays freezing: moving water takes longer to ice over than still water.
Set up a garden chair five or six metres from the bath on a May morning during migration and you will see species that have been flying over your garden for years without stopping.
One pinhole. That is all it takes. 🪺
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