|Population:||The species occurs in at least 10 isolated areas on mainland Java, although some additional, probably very small populations, might survive elsewhere (Semiadi and Meijaard 2006). For example, recently another pocket area was found in Banjar (West Java), though intensive survey work is needed to establish the size of the area and the population (Semiadi 2007 unpubl. data). There are no estimates of overall population size, but the species has shown a rapid population decline in recent decades. Compared to a survey conducted in 1982, 17 of the 32 (53%) populations are extinct or have dropped to low encounter rate levels (Semiadi and Meijaard 2006).|
Semiadi and Meijaard (2004), as a result of widespread interviews, reported the species from the following areas:
- S. verrucosus occurs in the area between Malingping and Rangkasbitung, but is rarely encountered. There were no reports of recent kills of verrucosus, but some were shot several years ago. Semiadi and Meijaard (2006) considered that that a small population probably remains. However, because S. scrofa is a major agricultural pest, hunting intensity is high
- Pigs are common in the area between Sukabumi and the coastal nature reserve of Cikepuh, and are considered a major agricultural pest. S. verrucosus, however, is rarely encountered, with two hunters reporting that they had not shot one since 1998. One hunter suggested that over-hunting was the most likely cause of the species’ decline.
- Interviewees in the area near Purwakarta reported the presence of S. verrucosus between the 1960s and 1990s, with steady declines of the weight of killed animals and numbers of pigs encountered. They now consider verrucosus to be very rare, the latest report being a specimen that was shot in 2001.
- Near and south of Garut several small populations remain, with reported sightings of S. verrucosus in 2002 and 2001.
- Around Majalengka and towards Sumedang interviewees reported recent sightings or killings of S. verrucosus, but all emphasize that the species is now much rarer than in the past. Pigs are much sought after here for illegally organized fights with dogs.
- A population of S. verrucosus still exists east of Tasikmalaya towards Ciamis. There were several reports of recent sightings or killings. Still, people consider S. verrucosus to be rare in comparison to S. scrofa.
- Several interviewees reported recent sightings of verrucosus from the area around Cilacap, Cipatujuh, and Nusakambangan Nature Reserve, including some from the Nusakambangan Nature Reserve offshore Cilacap, but the species seems to be rare and fragmented into many small populations.
- S. verrucosus is still relatively common around Subah, generally seen in small groups of 1–2 animals, but in up to 4–6 animals/group during mating season. Females with young are seen between August and December. S. verrucosus has not declined as much as S. scrofa, but one interviewee expected rapid population declines of the former because teak forests, its prime habitat, are disappearing.
- S. verrucosus appears to be relatively common around Blora and Bojonegoro, and every interviewee was familiar with the species and confirmed its local presence. Still, according to one interviewee, the species used to occur in groups of 10–20 animals, but now only 1–3 animals/group are encountered. Five to seven years ago, every hunt resulted in the capture of 1–2 S. verrucosus, or 2–3 according to another informant, but now the species is rarely caught; the most recent one in April/May 2003. One interviewee reported that pigs have especially declined since the fall of President Suharto in 1998, because then local people started to log the state-owned teak forests.
- Bawean island is the only area where the subspecies S. v. blouchi occurs. Several interviewees reported the presence of S. verrucosus on the island, but all sightings predated 2002, and the reports gave the impression that the species was now rare. A recent (c. 2004) survey of Bawean deer Axis kuhli on Bawean Island also yielded disturbing reports of the likely dramatic diminution of this species and all wild pig populations (including S. v. blouchi) on Bawean Island, reputedly as a consequence of severe hunting pressure following the transmigration settlement of Christian communities from Sumatra (these animals having been previously left mostly undisturbed by the formerly predominant Moslem communities; R. Ratajszsak, unpubl; pers. comm. to W. Oliver).