I have finally found a female and a male boar recently. So I have built a huge box of concrete with 6 block high walls for them to live, no roof. Went out for 1,5 days doing a level 5 quest. When I came back to my base there were boars everywhere. I saw them from far away on the road, in front of my doors, on my rooftop, at neighbours' gardens, literally everywhere. Plus about 40 more boars inside their concrete box.
They must have stacked more than those six blocks and escaped, right? Anyway, I killed all but a single female and a single male and got 7,5k meat. I think their reproduction rate should get reconsidered, though
Edit:
And another question:
I have built two rows of beehives on top of each other. Only the top beehives can be looted after a while, never the beehives on bottom. Does that work as intended and what am I missing?