The term 'fly catching bird' refers to two species of birds, the pewee (5 letters) and the PHOEBE (6 letters). The pewee is a small, grayish-brown bird with a white belly and a white line over its eye. It is found in North America and is known for its loud, distinctive call. The PHOEBE is a larger, darker bird with a white throat and breast. It is found in both North and South America and is known for its habit of catching insects in mid-air. Both species are important members of the flycatcher family.