A Second Phoebe At The Trinity River Audubon Center

This one was closer and not as hidden. Their call really does sound like they are saying "Phoebe, Phoebe"
Eastern Phoebe (Sayornis phoebe)

Eastern PhoebephoebeSayornis phoebeflycatchertinycamouflageTrinity River Audubon Centerdallas texasdistinctive callperchedclose up

From Other assorted birds