It's interesting that you mention PoE nature cams- I designed a PoE home surveillance system for a friend that involved setting up a solar panel on a 30' pole that fed a box with a shitty camera system in it at ground level. From there he set the cams around his property- particularly where the foxes and coyotes would travel to get to his hens. The whole project was apparently about $800 aside from the solar panel (I just gave him the idea- I didn't help him build it).

He eventually got rid of the cameras because, well... They were shitty and only told him the critters were near AFTER he popped 'em. I think he's got a for-purpose system (in his own words "the new cameras didn't fall off a truck") now but it was a fun project!