193 Snakes Can Smell Themselves

The mirror test is often used to try and determine if animals have self recognition. If they recognise it is them in the mirror, they will react to a change in their appearance. But for snakes, sight is not the primary sense, so scientists have had to get a bit more creative.
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Main Paper References:
Freiburger T, Miller N, Skinner M. 2024. Olfactory self-recognition in two species of snake. Proceedings of the Royal Society B: Biological Sciences 291:20240125. DOI: 10.1098/rspb.2024.0125.
Other Links/Mentions:
Maggie Koerth-Baker. 2010. Kids (and Animals) Who Fail Classic Mirror Tests May Still Have Sense of Self. https://www.scientificamerican.com/article/kids-and-animals-who-fail-classic-mirror/
Fejervarya cancrivora call by Zaharil Dzulkafly from: AmphibiaWeb - Fejervarya cancrivora
Crocodile sister hero: https://www.bbc.co.uk/news/uk-england-berkshire-69002147.amp 
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