The problem in india with vultures and diclofenac maybe isn't a good example, or warfarin and rats: the contraceptive isn't designed to kill, so its a far lower dose and there's no increased carrion risk, since it won't be killing the squirrels.

I'm not saying there's zero risk of a hormone disruptor in the food chain, but I don't think scots hawks and eagles predate squirrels as their main or sole food source: https://www.wildlifeonline.me.uk/animals/article/squirrel-pr... suggests its marginal from a squirrel population dynamic point of view.