Flying Snake

Flying Snake MM p322 A flying snake is a brightly colored, winged serpent found in remote jungles. Tribespeople and cultists sometimes domesticate flying snakes to serve as messengers that deliver scrolls wrapped in their coils.
  Flying Snake MM p322 Tiny Beast, Unaligned Armor Class 14 Hit Points 5 (2d4) Speed 30 ft., fly 60 ft., swim 30 ft. STR DEX CON INT WIS CHA 4 (-3) 18 (+4) 11 (+0) 2 (-4) 12 (+1) 5 (-3) Senses blindsight 10 ft., passive Perception 11 Languages — Challenge 1/8 (25 XP) Proficiency Bonus +2 Flyby. The snake doesn't provoke opportunity attacks when it flies out of an enemy's reach. Actions Bite. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 1 piercing damage plus 7 (3d4) poison damage. Environment: Desert, Forest, Grassland, Urban Source: MM, page 322. Also found in SKT; ToA; WDH; IDRotF; KftGV. Available in the SRD.