The compound (Alphachloralose) is related to chloral hydrate, an old fashioned human sleeping medication.
The way it works on pigeons is it puts them to sleep and, if temp is below about 15 degrees C, they simply die of hypothermia. A kind death if I might say so.
Birds other than pigeons who have ingested it, e.g. native birds, if found in time can be put into a warm room and usually recover. Not sure about the effect on equines, just don't go there.
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