In its granular form, a single grain will kill a bird. Birds often eat numerous grains of the pesticide, mistaking them for seeds, and then die shortly thereafter. Before the granular form was banned by the EPA in 1991,[15] it was blamed for millions of bird deaths per year. the liquid version of the pesticide is less hazardous to birds since they are not as likely to ingest it directly, but it is still very hazardous.[weasel words]