Myrmecia nigriceps
In 3 days ~10% in a week ~20%
Myrmecia nigriceps, also known as the black-headed bull ant, is a species of ant endemic to Australia. A member of the genus Myrmecia in the subfamily Myrmeciinae, it was first described by Austrian entomologist Gustav Mayr in 1862. These ants are large, varying from 19 to 23 millimetres (0.75 to 0.91 in) in length. However, colonies contain workers that are much smaller, usually half the size of normal workers. The queens are the largest while the males are the smallest, which can be easily identified due to their small mandibles.
Mainly nocturnal M. nigriceps is found in hot hilly areas and woodland, nesting underground in mounds. The ant's diet consists of sweet liquids from flowering plants and invertebrate prey, which are fed to the carnivorous larvae. Spiders are known to eat these ants, and echidnas consume the larvae and pupae. Like other Myrmecia species, M. nigriceps ants possess a powerful and painful sting, and the venom is capable of inducing allergic reactions in sensitive people.
First identified by Gustav Mayr in 1862, Mayr provided the first description of M. nigriceps in his journal Myrmecologische Studien. The species was described under the binomial... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Grampians National Park | 🇦🇺 Australia | |
| 2 | Blue Mountains National Park | 🇦🇺 Australia |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Sydney | 🇦🇺 Australia |
Rare
Under 5% of wildlife watchers report a Black-Headed Bull Ant sighting in Blue Mountains National Park on a given day, based on 5 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 681st most-seen of the 789 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 20%, if each day is a fresh chance.
March, August and October–November
In those months about 10% of wildlife watchers report a Black-Headed Bull Ant in Blue Mountains National Park on a given day, against under 5% in April–July, September and December–February, the lowest months.
Between 1 and 4 pm
Across all the parks we cover, that three-hour window holds the most Black-Headed Bull Ant sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
2nd of 2
Of the 2 parks where we can rate Black-Headed Bull Ant sightings, Blue Mountains National Park ranks 2nd at under 5%. The best odds are in Grampians National Park (Australia, about 20%).
Same genus: Myrmecia
The closest relatives of the Black-Headed Bull Ant that you can see in Blue Mountains National Park (genus Myrmecia, Bull Ants) are Australian Red Bull Ant (about 10%), Australian Jumper Ant (about 10%) and Giant Bulldog Ant (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Black-Headed Bull Ant is recorded against all the insects logged in Blue Mountains National Park (5 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.
