A small, energetic passerine about 9 to 10 cm (3.5 to 4 in) long, the forty-spot is similar to the much commoner spotted pardalote (Pardalotus punctatus), but has a dull greenish-brown back and head, compared to the more colourful plumage of the former, with which it shares its range, and there is no brow line. The rump is olive, the under-tail dull yellow. The chest is white with light yellow tints. The wings are black with white tips, appearing as many (closer to 60 than 40) discrete dots when the wings are folded. There is no seasonal variation in plumage; juveniles are slightly less colourful than the adults.
Now found reliably only in a few isolated colonies on south-eastern Tasmania, most notably on Maria Island and Bruny Island. It is occasionally reported from the suburbs of Hobart. Sedentary or locally nomadic over its restricted range, it is declining in numbers and listed as endangered. It is most successful on Maria Island, which is managed as a refuge. Sites identified by BirdLife International as being important for forty-spotted pardalote conservation are Bruny Island, Central Flinders Island, Maria Island and South-east Tasmania.
Relatively dry eucalypt forests with high concentration of the white gum, where it forages almost exclusively.
Forty-spots form pairs and are territorial during the breeding season, but may form small flocks during the winter. They are insect hunters and forage methodically for small insects in the canopy. They nest in tree hollows and occasionally in ground burrows.
- BirdLife International (2012). "Pardalotus quadragintus". IUCN Red List of Threatened Species. Version 2013.2. International Union for Conservation of Nature. Retrieved 26 November 2013.
- "Forty-spotted Pardalote". Important Bird Areas. BirdLife International. 2012. Archived from the original on 2007-07-10. Retrieved 2012-11-01.