Echolocation. The bat can't use its blindsight while deafened.
Keen Hearing. The bat has advantage on Wisdom (Perception) checks that rely on hearing.
Actions
Bite. Melee Weapon Attack: +0 to hit, reach 5 ft., one creature. Hit: 1 piercing damage.
Keen Smell. The cat has advantage on Wisdom (Perception) checks that rely on smell.
Actions
Claws. Melee Weapon Attack: +0 to hit, reach 5 ft., one target. Hit: 1 slashing damage.
Amphibious. The crab can breathe air and water.
Actions
Claw. Melee Weapon Attack: +0 to hit, reach 5 ft., one target. Hit: 1 bludgeoning damage.
Amphibious. The frog can breathe air and water.
Standing Leap. The frog's long jump is up to 10 feet and its high jump is up to 5 feet, with or without a running start.
A frog has no effective attacks. It feeds on small insects and typically dwells near water, in trees, or underground. The frog's statistics can also be used to represent a toad.
Keen Sight. The hawk has advantage on Wisdom (Perception) checks that rely on sight.
Actions
Talons. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 1 slashing damage.
The hawk's statistics can also be used to represent a seagull.
Actions
Bite. Melee Weapon Attack: +0 to hit, reach 5 ft., one target. Hit: 1 piercing damage.
Hold Breath. While out of water, the octopus can hold its breath for 30 minutes.
Underwater Camouflage. The octopus has advantage on Dexterity (Stealth) checks made while underwater.
Water Breathing. The octopus can breathe only underwater.
Actions
Tentacles. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 1 bludgeoning damage, and the target is grappled (escape DC 10). Until this grapple ends, the octopus can't use its tentacles on another target.
Ink Cloud (Recharges after a Short or Long Rest). A 5-foot-radius cloud of ink extends all around the octopus if it is underwater. The area is heavily obscured for 1 minute, although a significant current can disperse the ink. After releasing the ink, the octopus can use the Dash action as a bonus action.
Flyby. The owl doesn't provoke opportunity attacks when it flies out of an enemy's reach.
Keen Hearing and Sight . The owl has advantage on Wisdom (Perception) checks that rely on hearing or sight.
Actions
Talons. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 1 slashing damage.
Actions
Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 1 piercing damage, and the target must make a DC 10 Constitution saving throw, taking 5 (2d4) poison damage on a failed save, or half as much damage on a successful one.
Blood Frenzy. The quipper has advantage on melee attack rolls against any creature that doesn't have all its hit points.
Water Breathing. The quipper can breathe only underwater.
Actions
Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 1 piercing damage.
A quipper is a carnivorous fish with sharp teeth. Quippers can adapt to any aquatic environment, including cold subterranean lakes. They frequently gather in swarms
Keen Smell. The rat has advantage on Wisdom (Perception) checks that rely on smell.
Actions
Bite. Melee Weapon Attack: +0 to hit, reach 5 ft., one target. Hit: 1 piercing damage.
Mimicry. The raven can mimic simple sounds it has heard, such as a person whispering, a baby crying, or an animal chittering. A creature that hears the sounds can tell they are imitations with a successful DC 10 Wisdom (Insight) check.
Actions
Beak. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 1 piercing damage.
Water Breathing. The sea horse can breathe only underwater.
Spider Climb. The spider can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.
Web Sense. While in contact with a web, the spider knows the exact location of any other creature in contact with the same web.
Web Walker. The spider ignores movement restrictions caused by webbing.
Actions
Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one creature. Hit: 1 piercing damage, and the target must succeed on a DC 9 Constitution saving throw or take 2 (1d4) poison damage.
Keen Hearing and Smell. The weasel has advantage on Wisdom (Perception) checks that rely on hearing or smell.
Actions
Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 1 piercing damage.