assuming light colored birds how about food coloring?
a good size Dab on the wings or back in various colors. its perfectly safe and will fade/wash out over a period of about 1-2 weeks.
its cheap, its easy its bright, its safe and it will fade/wash out over a relitivly short period of time just be sure you wear gloves as it will stain your skin too!
i have however heard of ganders mounting other ganders ect..so i agree with others that vent sexing would be a better idea.
a good size Dab on the wings or back in various colors. its perfectly safe and will fade/wash out over a period of about 1-2 weeks.
its cheap, its easy its bright, its safe and it will fade/wash out over a relitivly short period of time just be sure you wear gloves as it will stain your skin too!
i have however heard of ganders mounting other ganders ect..so i agree with others that vent sexing would be a better idea.