Apple Cider Vinegar should be mixed with water, 5ml ACV to 1 litre water. Give to pigeons one week on, one week off. They are fond of bathing in it as well as drinking it. I am looking after 70 wild pigeons so not possible to treat them individually as they do not like being handled by humans. It is advisable to get a pH test kit to make sure the pH is reading 4.5–5 as you will find a variance in pH in different areas. Canker protozoa do not like acid water. ACV acts both as a tonic/probiotic and kills mites/lice.Hmmmm...do you do SOLID ACV or combine w water? Bathwise...darn, they can gulp it also? Wow ...who knew...yeah please confirm this. Good to know if I end up bringing 1 here.