Reddit mentions of Skull Scrying: Animal Skulls in Divinatory Trance Work

https://www.ladyalthaea.com/every-day-is-magickal/bone-collecting

https://aminoapps.com/c/thewitchescircle/page/blog/bones-and-their-uses/p48a_BYtQuRvrqVv3Qo1z7z64bDpjRGrP7

https://www.amazon.com/Skull-Scrying-Animal-Skulls-Divinatory/dp/151921880X/ref=pd_sbs_14_2/130-0524347-5500533?_encoding=UTF8&pd_rd_i=151921880X&pd_rd_r=28aa7bef-4c17-4303-97e3-eecddc9e28e9&pd_rd_w=w9zbU&pd_rd_wg=wuVzp&pf_rd_p=52b7592c-2dc9-4ac6-84d4-4bda6360045e&pf_rd_r=7X6HDN1V5H1C1WT50HC5&psc=1&refRID=7X6HDN1V5H1C1WT50HC5

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These sources were found with some google searches, I do not know much about them but they might be useful to you.

I personally collect bones I find, and one pheasant skull I bought. I try to do it as respectfully as possible. I have not used them for any spells before, rather than I just have them on my altar. I feel like using the bones I have in particular would be disrespectful to the animals. In 2 of the skulls (including the pheasant) I can still feel their presence. I just let them stay in my room peacefully, trying to rarely move them. BUT I am sure that many witches use them for their craft and that is why I attached the sources.