This is the BirdNET-Lite model, with bird sound recognition for more than 6,000 species worldwide. This is the default option and will generally work very for people in most of the world.
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BirdNET_GLOBAL_3K_V2.2_Model_FP16 (2022)
This is the BirdNET-Analyzer model, a newer work-in-progress project with aims to improve on the BirdNET-Lite model. Currently it only supports about 3,500 species worldwide, meaning for some regions (North America, Europe, Australia) it will usually outperform the BirdNET-Lite model, but for other regions it will be worse.
[ In-depth technical write-up on the models here ]