What's the difference between tattler and yelper?

Tattler

Definition:

• (n.) One who tattles; an idle talker; one who tells tales.
• (n.) Any one of several species of large, long-legged sandpipers belonging to the genus Totanus.

Example Sentences:

Yelper

Definition:

• (n.) An animal that yelps, or makes a yelping noise.
• (n.) The avocet; -- so called from its sharp, shrill cry.
• (n.) The tattler.

Example Sentences:

• (1) These "yelpers" and "screamers" include his frenemy, David Cameron.