African Geese - I don't know how "rare" they are, but when I wanted some they were next to impossible to source. I choose them as a breed as they are totally non-aggressive, and though I loved the idea of geese I didn't want something around that attacked everything.
They have proved charming and very non-aggressive. Laid a fair number of eggs, and the gander fertilized pretty well 100 percent of her eggs, and those of another goose as well. All in all - what it said on the tin
I also had tremendous difficulty when I wanted some Exhibition Rouen Ducks- again I wanted something placid, and that would eat my slugs and horse flies, and again did what they said. They are also said to taste delicious, though I cannot verify this
I will try and post some photos
All the best