Depends a bit on what you want to consider a “weasel”
The weasel family (mustildae) is pretty diverse, we don’t necessarily call everything in that family a “weasel” but that distinction is somewhat arbitrary.
It includes all manner of critters from the Least Weasel (yes, that’s seriously what someone decided to call the smallest weasel) that can be as small as about 4½" in length and weigh about an ounce or so
Up to Giant Otters that can reach about 5’7" in length or Sea Otters that can weigh about 100lbs
And in between you have some things like badgers and wolverines
You got a typo for mastodon (mastadon)
I don’t really have any input on how it is to self-host, but I’ve been playing around with friendica a bit and I think that has a lot of potential and may be worth mentioning. I think it has a lot of potential as almost a unified fediverse portal in addition to its obvious purpose of being a Facebook alternative, from what I’ve seen it seems to play pretty nicely with a lot of other fediverse services, and also supports RSS feeds
It needs some polishing, I think the default UI is pretty wonky, but there’s a lot of functionality there if you can be bothered to figure it out.