When people set these cakes or pellets out, they think this poisons only the target animals. But damage to wildlife and pets occurs, in addition to potentially threatening children. Remember this is tasty stuff. When it dies, vultures and other scavengers eat it, and they die. The effects are far-reaching going up the chain, each one poisoning the next link.
Organs bleed and the scent draws other animals.
The scavengers in turn eat those. The poison destroys the clotting factor and this effect can last up to 20 days, post-exposure. Rodenticides are sold under a large number of trade names. The humane alternative to poisons is the use of multi-catch rodent traps. After trapping, the rodents may be relocated.