Licence: Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)
Credit: Oestrus detection: "Flehman lip curl". Royal Veterinary College. Source: Wellcome Collection.
![no text alternative](https://iiif.wellcomecollection.org/image/A0000504/full/800%2C/0/default.jpg)
Licence: Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)
Credit: Oestrus detection: "Flehman lip curl". Royal Veterinary College. Source: Wellcome Collection.