No names, commonly referred to as 'nonames', are players in the game that simply have no name as a means of ambushing, attacking, hiding from hostile players. by copying and pasting :

ܐܒܘܢ ܕܒܫܡܝܐ. Though their obligations vary, nonames usually utilize no naming as a means to insult or kill other birds in the game. No names vary, but most are Starlings or Robins, as they are quick, small, and not so easy targets. Less commonly, in not-so-crowded servers, they may be Crows, Seagulls or even Eagles.

Many people seem to think that typing in '_____' to become a noname works, however that is not true as this glitch was fixed a long time ago.