Because they work opposite of each other. They are both muscles in the arm, yet work, they work opposing sides of the arm. The dictionary says this about Antagonistic:
acting in opposition; opposing, especially mutually.
one under par is called a "birdy" 2 under par is called "eagle"
It is not called a boogie. One over par on a hole is called a bogie.
par sparrow is native to New Zealand
It is called an eagle; if you happened to get a 2 on a par 5 that's called an albatross!
On a par 3, it's an eagle. On par 4, it's a double eagle. On a par 5, it's called either an albatross or a lie.
It is called a double eagle or a hole in one.
One under par on a hole is called a "birdie".
2 shots below par is an Eagle.
eagle
It's called the Iris.
bogie
depends on how many strokes it took to there. if one-eagle two-birdie three-par