The term 'chickadee' is used to refer to three species of small birds in the Paridae family. The first species is the tit, which is a small passerine bird found in Europe, Asia, and North America. The second species is the TITMOUSE, which is a small songbird found in North America. The third species is the BLACKCAP, which is a small passerine bird found in Europe and Asia. All three species are known for their distinctive calls and cheerful personalities.