What do California condors and New Zealand's kea have in common? Both are threatened by lead poisoning. by +Cristy Gelling

New Zealand’s kea* are among the most devastatingly intelligent birds on the planet. For instance, animal cognition researchers say kea are as smart as crows at solving mechanical puzzles. So it comes as a shock to learn that much of what we know about the kea’s unusual behavior in the wild comes from studies of birds stultified by lead poisoning.
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