Black Friday: lifetime access is on a special offer in the app, until November 30. Black Friday: special offer on lifetime access, until November 30. Download
조류학은 새들의 행동과 생태를 연구하는 학문입니다.joryuhak-eun saedeul-ui haengdong-gwa saengtae-reul yeonguhaneun hakmun-imnida.Ornithology is the study of the behavior and ecology of birds.