Red and Grey Kangaroos are found in the park, and Euros can sometimes be seen on the slopes of Wild Dog Hill at sunset. Smaller, inconspicuous mammals are also present; the Common Dunnart is a carnivorous mouse sized marsupial which eats grasshoppers and small lizards.
Over 80 species of birds have been observed in the Park. Wedge-tailed Eagles and Australian Kestrels can sometimes be seen soaring in the thermals over Wild Dog Hill. The beautiful song of the Grey Butcherbird is frequently heard.
Whyalla Conservation Park is also home to some rarer bird species including the Western Grasswren, Slender-billed thornbill, Hooded Robin and Elegant Parrots. Other bird species that can be seen more regularly include the Crested Pigeon, White-browed Babbler, Spiny-cheeked Honeyeater and the Black-faced Woodswallow. More than 20 species of reptiles have been recorded in the Park. The Western Brown Snake, Bearded Dragon, Western Bluetongue and Sleepy Lizard are the most commonly seen species. When disturbed, small Striped Skinks scuttle for cover in the undergrowth.