Alligator sinensisFauvel, 1879

T'o

Identification not confirmed. One observer recorded this animal as this species and no one has since agreed, so the photograph may show a different animal.

Photograph placed in the public domain, CC0, via iNaturalist

A day-active, meat-eating crocodilian from the Oriental region, reaching 246 cm nose to tail.

Also called Chinese alligator, Yangtze alligator, Yow Lung.

Reptilia › Crocodylia › Alligatoridae › Alligator

Grows to: 2460mm; greatest recorded
Eats: Carnivorous
Active: Diurnal
Lives up to: 70years

What is known

33 sourced facts, each taken from a named scientific dataset. How to read these.

Cited from a dataset unless a row is marked otherwise.

Standing in the world

Conservation status: Critically Endangered
Population trend: Stable

The animal itself

Colour on the back: Black, Gray
Pattern on the back: Uniform
Pupil: Vertical slit
Venomous: No
Fangs: None
Longest recorded life: 70years
Body temperature when active · measured in the wild: 23.7°C75 °F
Body temp in the wild · mean, when active: 23.4–25.3°C74–78 °F

Size

Length nose to tail · greatest recorded: 2460mm8 ft 1 in
Largest juvenile · snout to vent: 102mm4 in
Body mass · greatestcomputed: 84,000g185 lb
Body mass · a typical adult: 14,600g32 lb
Body mass at hatching: 46.5g1.6 oz

How it lives

Diet: Carnivorous
Active: Diurnal
Where it lives: Arboreal, saxicolous, terrestrial
Habitat: Wetlands
Region: Oriental
Highest it lives · above sea level: 400m

Breeding

Reproduction: Oviparous
Sex decided by: Temperature
Average clutch: 20.25eggs
Eggs or young per clutch: 20–30eggs
Clutches in a year: 1per year
Egg length: 60.8mm2.5 in
Egg width: 33.6mm1.25 in
Age at first breeding · female: 2191days

Naming and history

Subspecies: No
Described by: Fauvel
Moved to another genus · since it was first described: No
Described in: 1879

Keeping one

T'o is assessed as Critically Endangered on the IUCN Red List. Species at risk in the wild are often covered by CITES and by national law, which decide what may be bought, sold, moved across a border or kept at all — and captive-bred and wild-caught animals are usually treated differently. Check the rules where you are before acquiring one. Nothing below is a judgement about keeping this species; it is what a published welfare standard says about space, and what the animal itself was measured doing.

Active animals measured in the wild averaged 75 °F (23.7 °C).

Mean body temperature of active individuals measured in nature. A measurement of the animal, not a setting for a thermostat.

Feeding

A prey item should be no wider than the space between the animal's eyes.

Widely used across reptile husbandry references. The stated reason is that the gap approximates the width of the throat, so wider prey is associated with impaction. This is established practice, not a measurement.

4677kJ per day

Worked out for an animal of 84,000 g, the heaviest recorded for T'o — so it is the top of the range, not a figure for a particular animal. Weigh yours and the number will be lower.

An upper estimate, not a feeding target, and not veterinary advice. The equation covers only what an animal burns staying alive, so a growing, gravid or recovering animal needs more — and it was measured on wild animals, which move far more than one in an enclosure. Body condition and a vet who knows the species are what a feeding decision should rest on. Where this comes from.

What nobody knows

These are not gaps in our research. No scientific dataset records them for this species — and saying so is information you cannot get from a reference that simply leaves a field out.

— Still living
— Length snout to vent · greatest recorded
— Length snout to vent · adult female mean
— Length snout to vent · adult male mean
— Length snout to vent · adult mean
— Female length · mean, nose to tail
— Length nose to tail · adult male mean
— Length nose to tail · adult mean
— Largest female · snout to vent
— Largest male · snout to vent
— Largest female · shell length
— Largest male · shell length
— Hatchling length · snout to vent
— Hatchling length · nose to tail
— Largest juvenile · shell length
— Body mass · adult female, mean
— Preferred body temperature · chosen in a laboratory gradient
— Eats arthropods
— Eats vertebrates
— Eats plant matter
— How it hunts
— How the young develop
— Gestation or incubation
— Mean clutch · smallest reported
— Mean clutch · largest reported
— Clutches a year · fewest
— Clutches a year · most
— First breeds from · youngest recorded
— First breeds by · oldest recorded
— Hatchling length · smallest recorded
— Hatchling length · largest recorded
— Mature from · youngest recorded
— Mature by · oldest recorded
— Size at maturity · smallest recorded
— Size at maturity · largest recorded
— Limbs
— Status assessed · the year the Red List last looked
— Red List criteria
— Biome
— Active season · shortest recorded
— Active season · longest recorded
— Density · lowest recorded
— Density · highest recorded
— Home range · largest recorded
— Suborder
— Infraorder
— Type locality
— Active in
— Mainland or island
— Lowest it lives · above sea level
— Range size

Others in Alligatoridae

Take this data

Everything on this page is available as data under CC BY 4.0 — use it freely, credit it, no permission needed.

This species as JSON · the whole dataset

Cite this page

The Reptile & Amphibian Encyclopedia (2026). Alligator sinensis. Retrieved 2026-09-08, from https://www.allanglescreatures.com/species/alligator-sinensis

@misc{alligator_sinensis_2026,
  title  = {Alligator sinensis},
  author = {{The Reptile & Amphibian Encyclopedia}},
  year   = {2026},
  url    = {https://www.allanglescreatures.com/species/alligator-sinensis}
}

Sources

Oskyrko, O. et al. (2024). ReptTraits: a comprehensive dataset of ecological traits in reptiles. Scientific Data. Used under CC BY 4.0.
AnAge, Human Ageing Genomic Resources (de Magalhães et al.), used under CC BY 3.0.
Catalogue of Life (dataset 3LR), used under CC BY.