ratera (from rat 1 )
1 adj. and n. Thief who steals things of little importance. Buscón, caco, pickpocket, bag cutter, neglect, deception, faltrero, garduño, gatera, lunfardo, matandono, manilargo, long hands, lighter, randa, raquero, raspa, rat. Rascal. Thief.
2 adj. Creepy
3 Applies to the bird that flies at ground level.