The most common breed of tarantula is the Chilean Rose Hair Tarantula (Grammostola rosea). Known for its docile temperament and striking appearance, it is often recommended for beginners in the hobby. This species is native to Chile and is recognizable by its pinkish-brown coloration and long legs. Its hardiness and adaptability make it a popular choice among tarantula enthusiasts.
It would be the Angus breed.
The Holstein breed.
Angus cattle are the most common.
Merinos
There are no 'breeds' of chinchilla, but the most common colour is a standard grey
I know the American Shorthair is a pretty common cat, but it might not be the MOST common. :)
mutt breed cats are most common but after that is the tabby cat
Broad-Breasted White turkey is the most common.
Adelie and Emperor penguins are the most common to breed on the Antarctic continent.
i am obese too.
The Holstein.
The most common breed of dogs are Labradors. They are highly intelligent, very active, easy to train and they make a great family pet. I would recommend buying one!