Piggy-backing on this topic -- I'd love to have a set (up to a dozen) of cheap devices watching the ground around our house, that could detect primarily, or eve

Piggy-backing on this topic -- I'd love to have a set (up to a dozen) of cheap devices watching the ground around our house, that could detect primarily, or even exclusively, snakes. I'm in regional Australia, so snakes near abodes are something we want to know about. Naive motion detection doesn't work, as their total volume within an image is tiny. From what little I can find of people trying to do this, AI/ML struggles, as snakes tend to move slowly and look an awful lot like a stick. Any pointers would be fantastic.