What does "country outlines" mean?

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Madden learned the list by watching videos such as “Countries of the World,” in which smiling, blinking, animated country outlines sing their names.

“I think it’s those catchy songs that really catches his attention,” Landicho said.

But when Madden recites them, it’s not in song. Instead, he calmly, carefully and correctly pronounces each name; even the ones with several syllables, like Azerbaijan and Uzbekistan.

Madden is only just beginning to learn to read, so he learned the countries from listening.