Weasel

Source: Monster Manual p. 340. Available in the SRD and the Basic Rules (2014)

"name": "Weasel"
"size": "Tiny"
"type": "beast"
"alignment": "Unaligned"
"ac": !!int "13"
"hp": !!int "1"
"hit_dice": "1d4 - 1"
"modifier": !!int "3"
"stats":
  - !!int "3"
  - !!int "16"
  - !!int "8"
  - !!int "2"
  - !!int "12"
  - !!int "3"
"speed": "30 ft."
"skillsaves":
  - "name": "Perception"
    "desc": "+3"
  - "name": "Stealth"
    "desc": "+5"
"senses": "passive Perception 13"
"languages": ""
"cr": "0"
"traits":
  - "desc": "The weasel has advantage on Wisdom (Perception) checks that rely on hearing\
      \ or smell."
    "name": "Keen Hearing and Smell"
"actions":
  - "desc": "*Melee Weapon Attack:* +5 to hit, reach 5 ft., one creature. *Hit:* 1\
      \ piercing damage."
    "name": "Bite"
"source":
  - "MM"
"image": "/3-Mechanics/CLI/bestiary/beast/token/weasel.webp"