Plants Toxic to Birds And Poisoning Symptoms   Toxic Plant Toxic part(s) Specific Toxin(s) Symptoms Avocado (Persea americana) Pit, leaves, unripe fruit, stems Unknown but related to cardiac toxicity Weakness, inability to perch, labored breathing, feather fluffing Black locust (Robina pseudoacacia) Bark, leaves, seeds Robitin, robin Vomiting, diarrhea, weakness, depression, collapse Blue-green algae (Microcystis aeruginosa) … Continue reading Plants Toxic to Birds And Poisoning Symptoms