If the material is poisonous, the antidote is often listed on the container. When using drugs, be sure to use the correct dosage. If you are unsure, call your veterinarian. Also, drugs that are safe in people and dogs may result in death when used in cats. Again, if your are unsure, call your veterinarian for advice.
Birds are more sensitive to air pollutants than people.
In the old days miners would take canaries into the mines with them to monitor the air quality. When the canaries began having difficulty breathing or died, it was a signal to the miners that the air was bad and to get out in a hurry. Strychnine is a commonly used rodenticide. It is also used in gopher baits. Domestic animals must be excluded from areas where rodent baits are placed.