Birds that are not halal to eat , whether they want to be violent or not, such as falcons , vultures, etc., the feces of these birds are light and unclean . Ruling: If the mentioned impurity touches any part of the cloth or body (eg , sleeve , hem , collar) then if less than one fourth of that part is applied then that part will be impure and must be washed. However, prayers can be performed without washing it. Because , I 'm so sorry. And if one-fourth of the amount or more is taken, it cannot be performed without washing or purifying it. Rather, it must be washed or purified. And the faeces of the birds which are halal to be eaten are pure. References: Sharhul Bekaya 1/124 Kanyud Dakayak p.16 So determine the type of bird and achieve holiness. However, if the impurity is in a small place, the whole cloth should not be washed under any circumstances.