I do have a lot of time for chickens, bees, smaller rare breed cattle and heavy horses (used for work), but the pig is the one for me! And not just any pig, but the Berkshire. They're intelligent, easy to manage, playful, friendly and, well, downright piggy.
Putting aside the anthropomorphism, they turn the ground over, dig out all the weeds, bring stones to the surface and fertilise as they go. You can turn their manure into bio-gas - of which they produce more than any other animal.
They also taste great and you can use almost every part of a pig. However, I will admit there is one downside to the Berkshire. They are without doubt (IMO) the world's tastiest porkers, but they're not a bacon pig. However, I'm prepared to accept that and buy in the occasional baconer.
I've had several other breeds but none have suited me or the way we work our croft as well as the Berkshire does.
And here's one of our Berkshire gilts - a Styberry Mermaid...

Here's to the pig!
Stonehead