You could start a conversation something like...
I was talking to this guy who keeps (insert whatever animal you're concerned about) and he says that he....then explain what you think would be better for the animal. You can say you tried it after doing it like whoever you're trying to educate and your animals did much better that way and then either try to continue the conversation or leave knowing you made the effort.
You could also ask if they're having any particular problems, heat, humidity, feeding etc. If so, that can be addressed issue by issue or by using the above opening.
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