Here are some general points to consider:
* Sudden death: If your chickens died suddenly and without any prior symptoms, poisoning is a possibility.
* Similar symptoms: Did all the chickens exhibit similar symptoms before they died? This could point towards a common cause.
* Recent changes: Have there been any changes in your chickens' environment or diet recently? This could include new feed, changes in water sources, or exposure to pesticides or chemicals.
* Clues at the scene: Look for any unusual substances near the chickens' bodies or in their feed and water.
* Evidence of ingestion: If possible, try to determine if the chickens ingested anything unusual.
It's very important to take the following steps:
1. Call a veterinarian: They can provide the best advice for diagnosing and treating your chickens.
2. Isolate the affected chickens: This prevents further exposure and potential spreading of the poison.
3. Collect samples: If possible, collect samples of the dead chickens, any suspicious substances, and the chickens' feed and water. This will help the veterinarian in determining the cause of death.
4. Prevent further contamination: Clean and disinfect any areas where the chickens were kept to avoid further poisoning.
Remember, it's vital to seek professional help if you suspect your chickens have been poisoned.