The Adventures of Paddy the Pelican (found early animated TV series; 1950s)
The Adventures of Paddy the Pelican is one of the first made-for-television cartoons from 1950 that aired on Chicago's WENR-TV.  This animated series was created by Sam Singer.  It originally debuted in the US. The series is about a pelican and his adventures with friends.
It's notoriously considered among the worst cartoons of all time. This is thanks to the obviously low production budget, which led to its characteristic pencil sketch animation, dark backgrounds, looping sequences, and poor lip syncing.
Only 6 episodes of the series were made, and since October 2016, every episode is available for viewing below: