D. australis

D. australis may refer to:
 * Delma australis, a lizard species in the genus Delma
 * Diospyros australis, a shrub or small tree species found in Australia
 * Dryococelus australis, the Lord Howe Island stick insect, an insect species found on the Lord Howe Island Group
 * Duplicaria australis, a sea snail species
 * Dusicyon australis, the Falkland Islands wolf or warrah, an extinct land mammal species found only on the Falkland Islands