Vegetation

The park protects a rich variety of native flora.

Plant species include Silver Wattle, Sassafras, Snowy Daisy-bush, Cassinia, Mountain Correa, Musk Daisy-bush, Victorian Christmas Bush, Blanket Leaf and Hazel Pomaderris. Among the many ferns are the Rough Tree-fern, Soft Tree-fern and the rare Slender Tree-fern with its very narrow trunk sometimes reaching a height of almost 15 metres.

A major program of planting Mountain Ash (Eucalyptus regnans), Mountain Grey Gum (E. cypellocarpa), Manna Gum (E. viminalis), Messmate (E. obliqua), Blue Gum (E. globulus) and Blackwood (Acacia melanoxylon) is in progress to restore the pasture land to forest.

Animals

Birdlife is abundant, 91 species being recorded to date.

Among them:

• Superb Lyrebirds
• Crimson Rosellas
• King Parrots
• Wedge-tailed Eagles
• Olive Whistlers
• Grey Butcherbirds
• Tawny Frogmouths
• Eastern Spinebills
• Superb Blue Wrens
• Lewin's Honeyeaters
• the rare Sooty Owl and Powerful Owl.

Wombats, Swamp Wallabies, Echidnas, Sugar Gliders, Feathertail Gliders, Brush-tailed Possums, Ring-tailed Possums, bush rats, Brown Antechinuses and bandicoots are common. Koalas have been sighted and platypuses and Eastern Water Rats swim in the creeks and dig burrows in the banks.

The Giant Gippsland Earthworm (Megascolides australis) inhabits certain areas of the park but is never seen as it spends its entire life underground. Mount Worth State Park is the only area of protected public land where this rare and vulnerable invertebrate is known to occur. Reptiles found include Copperhead, Red-bellied Black and Tiger Snakes, Blue-tongued Lizards and numerous skinks.