But by the early 1600s, Saint Patrick’s Day had become inextricably linked to the green shamrock, leading to the modern emerald-hued celebration. Today, National Geographic celebrates Saint ...

One of the puppies, who's since earned the name Shamrock, was born with a dark green colored coat due to biliverdin, a bile pigment that sometimes mixes with a pup's amniotic fluid, causing a baby ...

CHICAGO -- A very special golden retriever puppy was born an unusual, vibrant shade of green. Named Shamrock, the little lady came into the world in Florida, often called the "Key Lime State" for ...