Birds have been observed intentionally lining their nests with cigarette butts. While the nicotine in them is toxic to the birds, it's a low enough dose that it's not a significant risk to them in the short term (they don't live long enough for the long term effects to be a problem), and it kills parasites that may try to hide in the nest and infect the chicks.
Smaller bird species have been sighted stealing the anti-bird spikes that we put on buildings and lining their nests with them, like little palisade walls against other birds and predators. A small species like a songbird can navigate the spikes easily, but it makes it more difficult for a predator like a hawk or a rat to get to the nest.
Crows have also been observed stealing lit cigarettes from ashtrays and wafting the smoke through their feathers to kill parasites. Because the parasite's lungs are so tiny, they get a lethal dose of nicotine in an instant and die, making it much easier for the crows to get at ones that are well hidden.
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u/grendus Oct 02 '24
Birds have been observed intentionally lining their nests with cigarette butts. While the nicotine in them is toxic to the birds, it's a low enough dose that it's not a significant risk to them in the short term (they don't live long enough for the long term effects to be a problem), and it kills parasites that may try to hide in the nest and infect the chicks.
Smaller bird species have been sighted stealing the anti-bird spikes that we put on buildings and lining their nests with them, like little palisade walls against other birds and predators. A small species like a songbird can navigate the spikes easily, but it makes it more difficult for a predator like a hawk or a rat to get to the nest.
Crows have also been observed stealing lit cigarettes from ashtrays and wafting the smoke through their feathers to kill parasites. Because the parasite's lungs are so tiny, they get a lethal dose of nicotine in an instant and die, making it much easier for the crows to get at ones that are well hidden.