The cat has advantage on Wisdom (Perception) checks that rely on smell.
Melee Weapon Attack: +0 to hit, reach 5 ft., one target. Hit: 1 slashing damage.
The spider can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.
While in contact with a web, the spider knows the exact location of any other creature in contact with the same web.
The spider ignores movement restrictions caused by webbing.
Melee Weapon Attack: +5 to hit, reach 5 ft., one creature. Hit: 7 (1d8 + 3) piercing damage, and the target must make a DC 11 Constitution saving throw, taking 9 (2d8) poison damage on a failed save, or half as much damage on a successful one. If the poison damage reduces the target to 0 hit points, the target is stable but poisoned for 1 hour, even after regaining hit points, and is paralyzed while poisoned in this way.
Web (Recharge 5-6)
Ranged Weapon Attack: +5 to hit, range 30/60 ft., one creature. Hit: The target is restrained by webbing. As an action, the restrained target can make a DC 12 Strength check, bursting the webbing on a success. The webbing can also be attacked and destroyed (AC 10, hp 5, vulnerability to fire damage, immunity to bludgeoning, poison, and psychic damage).
The toad can breathe air and water
The toad's long jump is up to 20 ft. and its high jump is up to 10 ft., with or without a running start.
Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 7 (1d10 + 2) piercing damage plus 5 (1d10) poison damage, and the target is grappled (escape DC 13). Until this grapple ends, the target is restrained, and the toad can't bite another target.
The toad makes one bite attack against a Medium or smaller target it is grappling. If the attack hits, the target is swallowed, and the grapple ends. The swallowed target is blinded and restrained, it has total cover against attacks and other effects outside the toad, and it takes 10 (3d6) acid damage at the start of each of the toad's turns. The toad can have only one target swallowed at a time. If the toad dies, a swallowed creature is no longer restrained by it and can escape from the corpse using 5 feet of movement, exiting prone.
Keen Hearing and Smell
The wolf has advantage on Wisdom (Perception) checks that rely on hearing or smell.
The wolf has advantage on an attack roll against a creature if at least one of the wolf's allies is within 5 ft. of the creature and the ally isn't incapacitated.
Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 10 (2d6 + 3) piercing damage. If the target is a creature, it must succeed on a DC 13 Strength saving throw or be knocked prone.
While out of water, the octopus can hold its breath for 1 hour.
The octopus has advantage on Dexterity (Stealth) checks made while underwater.
The octopus can breathe only underwater.
Melee Weapon Attack: +5 to hit, reach 15 ft., one target. Hit: 10 (2d6 + 3) bludgeoning damage. If the target is a creature, it is grappled (escape DC 16). Until this grapple ends, the target is restrained, and the octopus can't use its tentacles on another target.
Ink Cloud (Recharges after a Short or Long Rest)
A 20-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.
If the horse moves at least 20
feet straight toward a creature right before hitting
it with a hooves attack, the target must succeed
on a DC 14 Strength saving throw or be knocked
prone. If the target is prone, the horse can take a
bonus action to make another attack with its
hooves against the target.
Melee Weapon Attack: +4 to hit, reach 5 ft., one target.
Hit: 11 (2d6 + 4) bludgeoning damage.