 Because of the possible single @-@ egg clutch and the bird 's large size , it has been proposed that the dodo was K @-@ selected , meaning that it produced a low number of altricial offspring , which required parental care until they matured . Some evidence , including the large size and the fact that tropical and frugivorous birds have slower growth rates , indicates that the bird may have had a protracted development period . The fact that no juvenile dodos have been found in the Mare aux Songes swamp , where most dodo remains have been excavated , may indicate that they produced little offspring , that they matured rapidly , that the breeding grounds were far away from the swamp , or that the risk of miring was seasonal . 
