What significant change did Duolingo make to its iconic owl mascot (Duo) during its 2019 brand redesign?

Language learning apps have transformed how we approach new languages, with distinctive brand colors and mascots playing a crucial role in their recognition and appeal. Duolingo, one of the most popular language learning platforms, has carefully crafted its visual identity to create a friendly, approachable learning environment. How well do you know the evolution of this linguistic giant's brand identity?

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Changed from green to blue to represent trust and knowledge
Made Duo more cartoonish with larger eyes and a simplified design
Added language-specific cultural accessories to Duo for different courses
Replaced the owl with regional animals for different language markets