Cuculus optatus
Silhouette: Nicolas Huet le Jeune and Jean-Gabriel Prêtre (vectorized by T. Michael Keesey) · PhyloPic
In 3 days <5%
The Oriental cuckoo or Horsfield's cuckoo (Cuculus optatus) is a bird belonging to the genus Cuculus in the cuckoo family Cuculidae. It was formerly classified as a subspecies of the Himalayan cuckoo (C. saturatus), with the name 'Oriental cuckoo' used for the combined species. Differences in voice and size suggest that it should be treated as a separate species. The binomial name Cuculus horsfieldi has often been used instead of Cuculus optatus, but is now usually considered to be a junior synonym.
It is 30–32 centimetres long with a wingspan of 51–57 centimetres and a weight of 73–156 grams. The adult male has a grey head, breast and upperparts. The belly is creamy-white with dark bars. The vent is frequently buff with few markings. The legs and feet are orange-yellow and there is a bare yellow ring around the eye. Adult females and juveniles occur in two morphs. The grey morph is similar to the male but has a brownish wash on the breast. The rufous morph is reddish-brown above, paler on the underparts and with strong dark bands all over including the rump.
The common cuckoo (C. canorus) is very similar in appearance but is slightly bulkier with longer wings and... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Taroko National Park | 🇹🇼 Taiwan | |
| 2 | Nikko National Park | 🇯🇵 Japan | |
| 3 | Raja Ampat | 🇮🇩 Indonesia | |
| 4 | Daintree National Park | 🇦🇺 Australia |
Rare
Under 5% of wildlife watchers report an Oriental Cuckoo sighting in Tokyo on a given day, based on 62 verified sightings from GBIF citizen-science data. It is the 158th most-seen of the 229 birds we can rate there. Over three days the chance rises to under 5%, if each day is a fresh chance.
Any time of year
In every month with enough records, under 5% of wildlife watchers report an Oriental Cuckoo in Tokyo on a given day, so our monthly data shows no clear season.
Between 7 and 10 am
Across all the parks we cover, that three-hour window holds the most Oriental Cuckoo sightings with a recorded time, and about 7 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Among the best
Of the 9 cities where we can rate Oriental Cuckoo sightings, Tokyo ranks 5th at under 5%, level with the leaders once rounded. The best odds are in Sapporo (Japan, under 5%), Taichung (Taiwan, under 5%) and Kaohsiung (Taiwan, under 5%).
GBIF citizen-science records
It is estimated from how often the Oriental Cuckoo is recorded against all the birds logged in Tokyo (62 verified sightings), 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.
