Big Bird's colleagues in the crossword puzzle are Elmo, EGRET, EMU, RHEA, ROC, and MOA. Elmo is a four-letter Muppet character from the popular children's television show Sesame Street. EGRET is a five-letter wading bird of the heron family. EMU is a three-letter large flightless bird native to Australia. RHEA is a four-letter flightless bird that is native to South America. ROC is a three-letter mythical giant bird of prey. MOA is a three-letter extinct flightless bird that was native to New Zealand.