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Sites:

Zinc: Describes how paint fumes, lead, and zinc in items can be lethal to your birds. From Quaker Parakeet Society.

Avocado Toxicity: Informative site on bird keeping and care for pets and breeders. Information sheets on Hagen food and supply products. Many links to other bird related sites.

Heavy Metal Poisoning in Birds: HotSpot for Birds has many informative articles on the health and safety of birds. This article describes the toxic effect of heavy metals such as lead, brass and zinc on birds.
Lead Poisoning in Birds: Veterinarian describes the symptoms and treatment for this potentially fatal condition.

Teflon poisoning: The silent killer: Vet describes PTFE toxicity in birds, which is often fatal, caused by cookware and parts made with teflon or a non stick coating. By Old World Aviaries.

Testing for Zinc in Parrot Toys, Play Gyms, and Cages: Article discussing the problem of zinc toxicity in parrots, including how to test metal toy parts.

The Silent Killer: Discusses polytetraflouethylene (teflon fumes) which are deadly to birds.

Toxic Metals Weigh Heavy on Birds: A bi-monthly Environment Canada science bulletin, with a wealth of information on issues such as the Ozone Layer, Weather, Species at risk, etc.

Toxicoses in Birds: Discusses chocolate, alcohol, salt, and avocado toxicity. Including contaminated foods.

Warnings for Owners of Parrots and Other Birds: General principles of avian health with information on nutrition, veterinary care, behavioral issues, and cleanliess.

Why Caffeine is Toxic to Birds: HotSpot for Birds has many informative articles on the health and safety of birds. This article discusses the effect of caffeine on a bird's nervous system.

Zinc and Parrots: Article from the Proceedings of the International Aviculturists Society, January, 1997. Features details about zinc biology and bird cages.