Studying under orochimaru's place,sasuke was taught by orochimaru whose summoning were snakes, Hebi means snake. Later on he changed his team name to Taka which means hawk. read more
Later on he changed his team name to Taka which means hawk. It meant that after killing orochimaru the snake ie sasuke has been overpowered and attained new level ie of hawk. Well sasuke could summon hawk by that time. read more