Answer:
The "bean" is the seed, however it is not really a bean. In this seed, there is ricin, a deadly toxin. The lethal dose for adults is 4 to 8 seeds, however reports of poisoning are relatively rare. The symptoms of poisoning can be delayed up to 36 hours, but commonly it happens around 2-4 hours. This time period will usually include burning in the mouth and throat, purging, abdominal pain and bloody diarrhea. Within several days there will be severe dehydration, a drop in blood pressure and a decrease in urine. Unless treated, death is estimated in 3-5 days, however full recovery is usually achieved. These are the lethal doses for some animals commonly found in nature/farms or kept as domestic pets:
Rabbit - 4 seeds
Sheep - 5 seeds
Horse - 6 seeds
Pig - 7 seeds
Dog - 11 seeds
Duck - 80 seeds