What are these for...?

Came across these, wondering what they are for?https://uploads.tapatalk-cdn.com/202...74be9377a3.jpg

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looks like old bottom off coke bottle..... often see flower pots used like this...flour lure goes in it for possums,after a few days poison put in there too.....rain cant get in so baits dont get washed out.

Old cyanide bait station.

Love the fresh possum teeth marks beside it.

So you know when it's raining

Its seriously old. No one has used models like that for nearly two decades