Category: Indonesia

Pantropical Spotted Dolphin

Pantropical spotted dolphin

The pantropical spotted dolphin is a species of dolphin found in all the world’s temperate and tropical oceans.

The rise of so called, “Dolphin friendly” tuna capture (in the1980s), is thought to have saved millions of this species, in the eastern pacific. This  species was first described by John Gray in 1846. Gray’s initial analysis included the Atlantic spotted dolphin in this species. They are now regarded as separate. Both the genus and specific names come from Latin words meaning thin or thinning.

Two subspecies of the pantropical spotted dolphin are recognized, (Another unnamed subspecies, which inhabits inland Hawaiian waters, was recognized in Rice (1998)’s overview of marine mammal taxonomy, its unclear why this has not been fully recognized)

          S. a. attenuata or offshore pantropical spotted dolphin, found worldwide in tropical waters

          S. a. graffmani or coastal pantropical spotted dolphin, found in coastal waters in the eastern tropical Pacific. 

The pantropical spotted dolphin regularly making large, splashy leaps from the sea. It is a common Whale surfacing behaviour and will often clear the water for a second or more. Bow-riding and other play with boats is common. In the eastern Pacific, they often swim with yellow fin tuna (causing the problem with dolphin deaths caused by tuna fishing, though they do not eat them).  In fact, the two species have similar diets of small epipelagic fish. In other areas, the species may also feed on squid and crustaceans.

Indo-Pacific Humpback Dolphin

Indo-Pacific Humpback dolphin

The Indo-Pacific humpback dolphin (Sousa chinensis) is a species of humpback dolphin found in the coastal waters of the eastern Indian and western Pacific Oceans.In much of Asia it is referred to as the  Chinese white dolphin  Some biologists regard the Indo-Pacific dolphin as a subspecies of the Indian Ocean humpback dolphin  which ranges from East Africa to India, though DNA testing studies have shown that the two are distinct species. A new species, the Australian humpback dolphin, was split off from this species and recognized as a distinct species in 2014.  There are still need of clarification of the Indian Ocean-type and Indo-Pacific-type humpback dolphins and telling them apart.

Two subspecies of the Indo-Pacific humpback dolphin are currently recognized:

  • S. c. chinensis, or the Chinese humpback dolphin – fewer than 100 of this group remain
  • S. c. taiwanensis, or the Taiwanese humpback dolphin – fewer than 100 of this group remain
Given how close to extinction they both are, we can only hope that these two subspecies are capable of remerging.
 
Indo-Pacific humpback dolphins live in small groups, generally with fewer than ten individuals. They hunt as a group using echolocation. Adult dolphins come to the water surface to breathe for 20 to 30 seconds before diving deep again, for two to eight minutes (though it is rare that they stay under for more than 4). Dolphin calves, with smaller lung capacities, surface twice as often as adults, staying underwater for one to three minutes. They sometimes leap completely out of the water, though they may also rise up vertically from the water, exposing the dorsal half of their bodies. A pair of protruding eyes allows them to see clearly in both above and beneath the water surface.

 

Females reach sexual maturity at 10, while males do at 13. Gestation is 11 months, and rearing takes 3-4 years. The Indo-Pacific humpback dolphin is threatened by habitat loss, water pollution, coastal development, overfishing and an increase in marine traffic within its range. In 2015 the Indo-Pacific humpback dolphin was classed as “vulnerable” on the IUCN Red List of Threatened Species. In 2013 the number of dolphins around Hong Kong halved – it is thought because of pollution.

There is a dolphin-watching industry, that has been going around 30 years, in this area.

It is listed on CITES Appendix ii.

Sumatran Rhino

Sumatran Rhinoceros Photo Credit Kat Jenkinson

Sumatran Rhinoceros

Sumatran rhino is also known as a  hairy rhinoceros or Asian two-horned rhinoceros. Like the Javan rhino, the Sumatran rhino once had a range which covered a far larger area: rainforests, swamps and cloud forests in India, Bhutan, Bangladesh, Myanmar, Laos, Thailand, Malaysia, Indonesia and southwestern China, particularly in Sichuan.

There are still 3 on the island of Borneo, as you can see, the map still lists a population on the Malay peninsula though it is thought that this group is extinct. The 3 subspecies are:

  • The Sumatran island population: Western (34-47 individuals). This is unfortunately split in to 4 populations
  • The Borneo island population: Eastern (may be as low as 3). This was only discovered in 2016 in            East Kalimantan, after the population in Sabah, Malaysia (northern part of the island) was declared extinct in 2015
  • The mainland population: Northern (this is thought to be extinct as of 2010, but it is possible that a small group remain).
The Sumatran rhino spends most of its life alone, except for courtship and raising of young. It is more vocal than other rhino species, as well as communicating through marking soil with its feet, twisthing saplings into patterns, and leaving excrement. the species is much better studied than the similarly hard to see or find, for the Javan rhinoceros, in part because of a program which bought 40 Sumatran rhino into captivity in an attempt to preserve the species. Though a number of rhinos died once at the various destinations, and no offspring were produced for 20 years.

Only four areas are known to contain Sumatran rhinoceros: Bukit Barisan Selatan National park, Gunung Leuser national park, and Way Kambas National park on Sumatra, and on Borneo west of Samarindah.

We hope to be able to list trekking for seeing animals like this in the future, do get in touch if you work in this field.

Note:  to look at the rest of the rhino family click here

Javan Rhino

Javan Rhinoceros

Javan rhino are on the verge of extinction. They are currently restricted to the island of Java in Indonesia. Unfortunately, this is a bigger issue than a rare species that is likely to vanish from Java in the near future.

Up until the middle of the 1800, this rhinoceros species was found Java and Sumatra and onto the mainland of Southeast Asia and Indochina, northwest into East India, Bhutan, and the south of China.

Now, one might argue that many species had wider ranges 150 years ago, but the Javan rhino only declared extinct in Vietnam, back in 2010. In other words, just 13 years ago this species lost its last hold on the Asian mainland. Their closest relative is the Indian greater one-horned rhino (though this is not a recent split, they are separate species).

Now they are restricted to one national park in Java which sits on the far western tip. Here, lies the Ujung Kulon national park, a wilderness covering 1206km2 (466miles2) though 443km2 (171miles2) of that is marine. In this wilderness, roams the last Javan rhinos on the planet. It is currently thought that there are 74 of them in this area. It should be noted that the population has grown since the below video was made – mentions the population as 73.

Furthermore, the Javan and Sumatran Rhino species are not closely related, indeed with the Sumatran Rhino, it is thought to be more closely related to the African rhino, rather than the Asian Rhino species.

Below is an incredibly rare bit of footage of Javan rhino in their small patch of remaining wilderness, from a charity called SAFE (Saving Animals From Extinction).

Other animals found here include 35 endemic mammal species can be found in the park, including the banteng, silvery gibbon, Javan lutung, Crab-eating macaque, Javan leopard, Sumatran dhole, Java mouse-deer, Javan rusa, fishing can and smoothcoated otter. There are also 72 species of reptiles and amphibians and 240 species of birds

Note:  to look at the rest of the rhino family click here 

See Animals Wild