Thyreus nitidulus
In 3 days ~20% in a week ~40%
Thyreus nitidulus, commonly known as the neon cuckoo bee, is a parasitic bee of the genus Thyreus, called cuckoo bees. It is a stocky bee, notable for its brilliant metallic blue- and black-banded colors. Originally described by Danish entomologist Johan Christian Fabricius in 1804 as Melecta nitidula – from a collection in the Aru Islands or northern Australia – it was given its current scientific name Thyreus nitidulus in 1959 by M. A. Lieftinck. The specific epithet is derived from the diminutive of the Latin adjective nitidus "shining" (i.e. "little shiny one").
Several subspecies are known - the nominate race T. n. nitidulus is found across eastern and northern Australia, specifically New South Wales, Queensland, South Australia, and the Northern Territory, as well as New Guinea. Other species are found in Southeast Asia.
Like all bees, the neon cuckoo bee is covered by furry, branched, flattened hair, which is responsible for both the black and blue colours. Pale blue hair covers much of the face on the head, as well as patches on the sides of the thorax and the legs. The abdomen is striped with bright blue and black, and the transparent wings are purple-tinged brown in colour. The bee is sturdy in build, with a reinforced thorax.
The female neon cuckoo bee seeks out the burrow nests of the blue-banded bee (Amegilla cingulata), and lays an egg into a partly completed brood cell while it is unguarded. The larval cuckoo bee then consumes the larder and later emerges from the cell. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Raja Ampat | 🇮🇩 Indonesia | |
| 2 | Daintree National Park | 🇦🇺 Australia | |
| 3 | Royal National Park | 🇦🇺 Australia | |
| 4 | Blue Mountains National Park | 🇦🇺 Australia |
With luck
About 10% of wildlife watchers report a Neon Cuckoo Bee sighting in Blue Mountains National Park on a given day, based on 15 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 294th most-seen of the 789 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 40%, if each day is a fresh chance.
February–May, August and November–December
In those months about 10% of wildlife watchers report a Neon Cuckoo Bee in Blue Mountains National Park on a given day, against under 5% in January, June–July and September–October, the lowest months.
Between 9 am and noon
Across all the parks we cover, that three-hour window holds the most Neon Cuckoo Bee sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
4th of 4
Of the 4 parks where we can rate Neon Cuckoo Bee sightings, Blue Mountains National Park ranks 4th at about 10%. The best odds are in Raja Ampat (Indonesia, about 20%), Daintree National Park (Australia, about 10%) and Royal National Park (Australia, about 10%).
Same family: Apidae
The closest relatives of the Neon Cuckoo Bee that you can see in Blue Mountains National Park (family Apidae, Honey Bees, Bumble Bees, and Allies) are Charcoal Stingless Bee (about 10%), Golden-Green Carpenter Bee (about 10%) and Amegilla asserta (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Neon Cuckoo Bee is recorded against all the insects logged in Blue Mountains National Park (15 verified sightings from 2019 to 2026), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
