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Marine Mammals

The following table lists the species in this taxon assessed under the Singapore Red List, which is also published in the third edition of the Singapore Red Data Book.

You may find information for the conservation statuses assessed in the second edition Singapore Red Data Book (RDB2) and third edition Singapore Red Data Book (RDB3).

The information below is accurate as at the time of the listing online for the taxon.

Checklist of Marine Mammal Species with their Category of Threat Status for Singapore

Prepared by Sirius Z.H. Ng, Zeehan Jaafar

Family Genus Species Authority Common Name RDB2 RDB3
Delphinidae Orcaella brevirostris (Owen in Gray, 1866) Irrawaddy Dolphin Not Listed CR
Delphinidae Pseudorca crassidens (Owen, 1846) False Killer Whale Not Listed NE
Delphinidae Sousa chinensis (Osbeck, 1765) Indo-Pacific Humpback Dolphin EN CR
Delphinidae Tursiops aduncus (Ehrenberg, 1833) Indo-Pacific Bottlenose Dolphin Not Listed CR
Phocoenidae Neophocaena phocaenoides (Cuvier, 1829) Finless Porpoise CR CR
Physeteridae Physeter macrocephalus Linnaeus, 1758 Sperm Whale Not Listed NE
Dugongidae Dugong dugon (Müller, 1776) Dugong CR CR


The list of the Categories used in 3rd edition of the Red List is:





Not Threatened

Least Concern


Not approaching the above criteria



Approaching but not yet reaching the threshold for the above criteria




There are fewer than 1,000 mature individuals but more than 250 and there may or may not be any other evidence of decline, small range size or fragmentation.



There are fewer than 250 mature individuals and no other evidence of decline or fragmentation.

Critically Endangered


There are fewer than 50 mature individuals, OR if more than 50 mature individuals but less than 250, with some evidence of decline or fragmentation.




Presumed Nationally Extinct


The species is extinct (extirpated) within Singapore but it still survives outside Singapore.

Globally Extinct


The species is extinct all over the world, both in the wild and in cultivation







Other Categories

Data Deficient


Inadequate information to make an informed assessment

Not Applicable


Species that are not eligible for assessment at the national level (mainly introduced taxa and vagrants)

Not Evaluated



Species that are possibly eligible for assessment but have not yet been evaluated against the criteria

Not Listed


Species not listed in the records (in the IUCN Global Red List database, or the first edition Singapore Red Data Book - RDB 1 and second edition Singapore Red Data Book - RDB 2) for whatever reason

Last updated on 04 June 2024

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