Been using a few years ago, it really works and old timers will agree :-)
Works great ! Nasty taste according to cats tho
my birds loves these minerals. the breeding pairs go thru these like crazy.
Description
Black oil sunflower seeds in shell.
Black oil sunflower seed is a great source of quality protein, vitamins and minerals. The black oil seeds (“oilers”) have very thin shells, easy for virtually all seed-eating birds to crack open, and the kernels within have a high fat content, extremely valuable for most winter birds. It has particular high quantities of thiamine and niacin. It's main mineral ingredient is iron, which is a difficult nutrient to obtain in sufficient quantities. It also has anti-inflammatory properties.