Serrognathus titanus
In 3 days ~40% in a week ~70%
Serrognathus titanus is a species of beetle in the family Lucanidae. It was described by Jean Baptiste Boisduval in 1835. Huang and Chen (2013) separated Serognathus from the genus Dorcus by representing morphological characters and DNA analysis.
Males measure 32.0–111.3 millimetres (1.26–4.38 in) including mandibles; females 36.5–54 millimetres (1.44–2.13 in). It has an elongated, somewhat flat body dull black with blackish antennae and legs. Male's antler-like jaws have small teeth along inner edge and a pair of big teeth toward the bottom, and are forked at end. The head of a large male reaches nearly the length of its prothorax and abdomen combined.
Adults can be seen from May to August. They feed on tree juice, especially of Quercus species. Females lay eggs on the underground part of fallen oaks. The eggs hatch in about a month and the larvae feed on rotten wood. The larval period lasts about one year. The complete life cycle can last approximately from 1 to 2 years.
This species is widely distributed in Indonesia, the Philippines, Malaysia, Thailand, Vietnam, Laos, Myanmar, India, Japan, China, Taiwan and Korea. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Taroko National Park | 🇹🇼 Taiwan | |
| 2 | Khao Yai National Park | 🇹🇭 Thailand | |
| 3 | Kinabalu Park | 🇲🇾 Malaysia |
Possible
About 20% of wildlife watchers report a Titan Stag Beetle sighting in Taroko National Park on a given day, based on 27 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 77th most-seen of the 447 insects we can rate there. Over three days the chance rises to about 40%, and over a week to about 70%, if each day is a fresh chance.
June and July
In those months about 30% of wildlife watchers report a Titan Stag Beetle in Taroko National Park on a given day, against under 5% in February–April, September–October and December, the lowest months.
Between 7 and 10 am
Across all the parks we cover, that three-hour window holds the most Titan Stag Beetle sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Yes
Of the 3 parks where we can rate Titan Stag Beetle sightings, Taroko National Park has the highest daily chance: about 20%. Next come Khao Yai National Park (Thailand, about 10%) and Kinabalu Park (Malaysia, about 10%).
Same family: Lucanidae
The closest relatives of the Titan Stag Beetle that you can see in Taroko National Park (family Lucanidae, Stag Beetles) are Dybowski's Stag Beetle (about 20%), Dorcus rubrofemoratus (about 10%) and Dorcus miwai (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Titan Stag Beetle is recorded against all the insects logged in Taroko National Park (27 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.
