Mammals present within the reserves include western grey kangaroo, common brushtail possum, common ringtail possum and echidna. The lesser long-eared bat and the southern forest bat.
192 bird species have been recorded in the reserves. White-faced heron, great egret and royal spoonbill are commonly seen feeding in the estuary. During the summer months, waders feed on the samphire and tidal mudflats. Many of these birds migrate from the northern hemisphere to escape the arctic winter; they come from siberia, china and japan every australian summer to feed, but not to breed. They include the common sandpiper, sharp-tailed sandpiper and curlew sandpiper. Occasional sightings of black-tailed godwit, bar-tailed godwit and greenshank also are recorded for the estuary.
Approximately 20 fish species are recorded for the estuary and river. The major fish species include jumping mullet, black bream and yellow-eye mullet. Algae, molluscs and garweed form the major diet of the fish species.
Amphibian records include: common froglet, banjo frog, spotted marsh frog and brown tree frog. At least 20 reptile species have been recorded in the reserves. These include cunningham's skink, eastern bearded dragon and barking gecko.
Common butterfly species include: meadow argus, cabbage white, saltbush blue, australian painted lady, common grass-blue and lesser wanderer. Gahnia filum sedge-lands in the estuary may provide habitat for populations of the endangered yellowish sedge-skipper.