However, some breeds consistently rank among the rarest, including:
* Mangalitsa: This Hungarian breed with curly hair is critically endangered, with only a few thousand animals remaining.
* Meishan: This Chinese breed is known for its prolificacy but has a small population outside of China.
* Kunekune: Originating from New Zealand, this breed is known for its docile nature and unique curly tail. Their numbers are relatively low.
* Old Spot: This English breed with distinctive black and white spots is considered rare, with limited breeding programs.
* Tamworth: Another English breed, the Tamworth is known for its reddish-brown coat and good foraging ability. Their numbers have declined significantly in recent years.
It's important to note that many other breeds exist with small populations, and their rarity may be due to various factors like limited breeding programs, lack of demand, or changes in agricultural practices.