Well this was a fun game to play with the family. Here's some words we came up with:
Algae
Amphibians
Animals
Annual
Aquatic
Baby
Bacteria
Beasts
Bipedal
Birds
Blossoms
Buggers
Bugs
Bushes
Cacti
Carnivores
Cats
Crabs
Crawler
Creatures
Creepy-crawly
Critters
Critters
Dogs
Dolphins
Domesticated
Estuarine
Fauna
Fern
Fish
Flora
Flutterer
Flyer
Foliage
Forager
Fowl
Fungi
Furballs
Game
Grasses
Herbivores
Herbs
Insects
Invertebrates
Larvae
Lentic
Lichens
Lizards
Lotic
Mammals
Marine
Microbes
Mini-beasts
Molds
Moss
Moths
Nestling
Old
Omnivores
Pelagic
Perennial
Pests
Plankton
Pond dwellers
Pray
Predators
Primates
Protozoa
Prowler
Quadrapedal
Reptiles
Reptiles
Riverine
Rodents
Scavengers
Seedlings
Serpents
Sharks
Shelled
Shrubs
Spores
Swimmer
Symbiotes
Trees
Tropical
Varmint
Vertebrates
Vines
Viri
Weeds
Wetland
Whales
Wild
Worms
Yeasts
Young
xerophytic
Hope that was helpful.
Reminds me of this old advert from the UK