Tag: Population

Cassowary species

 PaleoNeolitic (montage creator) BS Thurner Hof Kora27 Martin Sordilla – Wikimedia Commons

Cassowary

  • There are 3 species of Cassowary, from left to right Southern, Northern and dwarf Cassowary. The Southern Cassowary is the 3rd largest and 2nd heaviest bird in the world, after ostrich and rhea.

90% of their diet consists of fruit. Having said this, they are classed as omnivores and take a range of foods including shoots and grass seeds, fungi invertebrates, eggs carrion fish and small vertebrates such as rodents, small birds, frogs, lizards and snakes. While all of the ratite family can eat meat, Cassowaries are by definition the most omnivorous, and while other ratites will eat meat when other food is scarce Cassowaries take more meat than others.

While the southern Cassowary has part of its range on Australia, all three have their main range on New Guinea

  • The southern Cassowary is listed as least concern by the IUCN, however with a 4400 individuals other agencies class it as endangered.
  • The northern Cassowary is also listed as least concern by IUCN and this population numbers 10,000-20,000
  • The dwarf Cassowary is listed as least concern as well. Unfortunately I cannot find estimates for this species, but with an overall population of 20,000-50,000 it is likely to be the most common
Adults are formidable enough that there is no regular predation. However, a range of birds such as the Papuan eagle, mammals such as the New Guinea singing dogs, and reptiles such as pythons and monitor lizards all take young when adults are not protecting enough.
Below is any news we have written on this species, and below that will be listed places you can see this species in the wild. Should you work in conservation or tourism on this range of species do get in touch through the list your wild place link on the home page.

Emu

Emu

The second tallest bird, after the Ostrich, the Emu is found in Australia. While its range covers most of the mainland, its close cousins which lived on the islands around Australia are all extinct.

They have soft brown feathers and cannot fly, though they can run at speeds of 30 miles per hour.

They can survive weeks without eating, and drink infrequently (though they drink a lot when they do drink).

Eggs hatch after 8 weeks, and young are fully grown at around 6 months, though they usually stay with the unit until the next breeding season.

While overall there are enough to list this species as least concern, it is not as rosy everywhere, with the Tasmanian Emu dying out in around 1800.

There are 3 currently surviving subspecies with 3 others extinct.

Their population lies between 625,000 and 725,000

Below is our usual roundup of articles on this species, unfortunately, given the length of the name, it is likely to appear within other names. Below this, you will find any links to aid in seeing this animal (as we make them)

Kiwi Species

Photo credit Tae Eke

Kiwi

It is thought that around 70,000 Kiwi remain on the two islands of new Zealand. One might think that this was high, but it is estimated that there were around 12 million before humans arrived – so around 0.5% of the population survives. More importantly, this is after a great deal of work has been done by many grassroot groups, in order to shore up the population – it has been far lower in the past.

Furthermore, roughly 2% of the umanaged kiwi are lost each week (around 20 birds). When well protected, a kiwi can live 25-50 years.

 

Rowi Kiwi

The rarest species, there are only thought to be around 450 of this bird remaining (as of last full survey in 2015). It is found in Ōkārito forest and surrounds in South Westland, predator-free islands of Marlborough Sounds, this is one of 5 designated kiwi sanctuaries declared in 2000.

 

As you can see, Kiwi is not a species but a group of species. While different species have been known to breed where their range overlaps, saving each species is a separate task

Tokoeka Kiwi

Translating to Weka with a walking stick, this species

  • Haast tokoeka is Threatened – Nationally Vulnerable 400
  • Southern Fiordland is Threatened – Nationally Endangered
  • Northern Fiordland tokoeka is Threatened – Nationally Vulnerable
  • Rakiura tokoeka is At Risk – Naturally Uncommon

Stoats are the main threat, with the total population numbering around 13000

Great Spotted Kiwi

Current population 14,000, it is restricted to the upper parts of the south islands national parks – specifically Sub-alpine zones of North West Nelson, the Paparoa Range, and Arthur’s Pass. 

The largest species, it is thought to be declining by around 1.6% a year.

There are 4 genetically distinct populations Northwest Nelson, Westport, Paparoa Range and Arthur’sPass–Hurunui.

There are plans in place to save the species but time will tell if they prove successful. 

 

Little spotted Kiwi

With a population of 1670it is found on Kapiti island (1200 are found on Kapiti island, from 5 translocated to the island early in teh 20th century) and 10 other pest free areas.

They start feeding themselves and roaming alone at 5-7 days, though they will return to the nest for around 60.

Each population is either stable or growing, so the overall trend is up.

Brown Kiwi

Living in lowland and coastal native forest and subalpine areas in the North Island, there are around 26,000 of this species. Although the most numerous, the population is reducing around 2-3% each year. It is estimated that without a change it will be lost in 2 generations.

Having said this, they have a greater capacity to recover, as unlike other species, they usually produce 2 eggs each time they mate, and can produce 2 clutches a year.

There are 4 distinct subspecies which live in different areas and do not interbreed.

  • Northland brown kiwi 8000
  • Coromandel brown kiwi 1700
  • Western brown kiwi 8000
  • Eastern brown kiwi 8000

Main threats is from predation by dogs.

As always, we are keen to add links that will allow people to book to see these animals in the wild. If you work as a tour guide or similar, do get in touch – click on list your wild place on the home page.

Rhea species

Rhea

Greater Rhea

Lesser Rhea

This map shows the range of a number of different subspecies

Found in Eastern South America, it is also known as the America, Common or Grey Rhea. In Portugese it is known as Ema. It is found in grasslands, Savanna or wet grasslands. When fully grown it weighs 20-27kg, and can live to around 10.5 years. It is listed as near threatened with a population of unknown size. Its range in South America is large, covering 6.5 million square km (2.5 million square miles).

Back in the  90s 6-8 individuals escaped from a private zoo in Germany, and this population has grown to around 550 birds.

Also known as the  Darwins rhea. Its found on the Andean plateau as well as Patagonia.

Mostly a herbivore, it will take lizards and animals such as grasshoppers when the opportunity arises. They are listed as least concern and there are two subspecies (see the map to the right). While the main subspecies still has a range of 850,000 square km, and a population that is healthy, both other subspecies (found further north) have populations of only several hundred.

Should either of these species get mentioned in the blog, they will appear below (though it is possible with a short name, the letters may appear in other articles).

As we make contacts which will allow you to see these species in the wild, they will be added below the news carrousel – do get in touch with the form at the top of the home page, we would love to help people fiind you

Ostrich

Both ostrich species Combined PaleoNeolithic photo credit Diego Delso&Ninara

Both ostrich species Combined PaleoNeolithic photo credit Diego Delso&Ninara

Ostrich

Common Ostrich 

Somali Ostrich

The common ostrich is found across a large part of the African Continent. Until 1919 there was a fourth subspecies of the common ostrich which was found across much of the Arabian Peninsular. It was completely extinct in the wild by 1972. They have now been reintroduced to Israel, Oman, Saudi Arabia, Jordan and United Arab Emirates – though it is hard to find accurate figures for how many are found there now. (Do get in touch if you operate a reserve with these birds present, we would love to help people find you).

As you can see, the other African subspecies  are still going.

The Somali Ostrich was only recognized as a separate species back in 2014, having been thought to be a subspecies until them.

A report to the IUCN in 2006 believed that this ostrich was common in central and southern Somalia until 1970-80. However, following the breakdown in the country, it is not surprising that conservation took back-stage, and it is questionable as to whether any remain (in the horn of africa).

In Kenya it is farmed for meat, feathers and eggs.

This is a map of the different Ostrich species and subspecies range

  • The yellow area, shows the range of the Somali Ostrich – Now recognized as a separate species.
  • The green area shows the range of the Massai Ostrich – while this population is listed as least concern, its numbers are in decline
  • The red is the South African Ostrich, this is generally secure, though only found within reserves.
  • The Orange is the range of the North African Ostrich: classed as critically endangered, it is only found in 6 of the 18 countries it originally roamed. It is the largest and heaviest subspecies. The countries it is still found in include fragmented pockets of Cameroon, Chad, Central African Republic and Senegal. They have also been reintroduced into Chad, Morocco and in 2014 (127 years after being lost) Tunisia. They were reintroduced to Saudi Arabia in the Mahazat as-Sayd Protected Area in 1994 and this population has done well with around 90-100 now living within this reserve

There is thought to be approximately 150,000 ostrich left in the wild. Having said this, like other large species, they are prone to local extinction. The best way to see these in the wild are to head to reserves where they still exist. 

Unfortunately, they are not easy to look after – in smaller reserves with large predators, they can be hunted and face local extinction. As such, while there are other reserves where they hang on, the majority of their remaining population are split between big reserves like the Kruger and the Serengeti, and small reserves like the Cape point national park in South Africa (this reserve is only 77.5 square km, or around 30 square miles and was in the past a big 5 nature reserve. Now, only the cape leopard is present and this is very rarely seen.

If you wish to see the Ostrich look in our list of wild places. Kruger, Okavango  and the Serengeti all have ostrich (in Kruger you need to look in the more sparsely area in the north of the park).

Iberian wolf

Iberian wolf

Restricted to the Iberian peninsular, this population, like many other European wolves hit a minimum back in the 1970s, we=here their population fell to just possibly as low as just 100, certainly no more than 500. Thankfully, this population has been allowed to recover, and is now thought to number between 2500 and 3000, though there is a great deal more space for further recovery.

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Golden Jackal found in France for the first time

Golden jackals are not native to France, probably as a result of of the presence of wolves. Unfortunately, wolf populations have dropped so low, that their presence is not stopping the spread of animals like this.

In this instance, the female was too young to have arrived on its own, suggesting that not only are golden jackals present, but they are breeding.

We will have to watch this space, and see what is happening. Will the recovering wolf population stop the spread, or are golden jackals going to become a permanent part of west Europe’s fauna?

To read more about golden jackals visit our golden jackal page here

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North Atlantic right whale population appears to be stabilizing!

The population of the north Atlantic right whales appears to have stabilized at around 350, having fallen from a peak of 483 in just 2010. In 2022 there were 356, down from 364 in just 2021.

Never a highly numerous species (it would appear) around 5500 were taken in the 3 centuries of whaling. The problem now, is that the population is so small that any looses imperil the whole species. Further, given the large amount of boating in the area, many of the remaining individuals have propeller scaring, and collisions are common and occasionally fatal.

Time will tell if this species can recover, though tourism interest is likely to give them a higher value to the local community and may help save the species.

Below is a short 5 minute video from the NOAA  (National Oceanic and Atmospheric Administration)

To visit our North atlantic right whale page click here   Should you operate in tourism for this species, do get in touch, we would love to help people find you- it costs nothing to be linked, we only take a small cut of any income we find for you. Click on List your wild place at the top of the page, or here

 

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Pangolins are returning to Kenya

Long thought to be extinct in the country, one was caught, back in 2018. As a result, effort is being put into protecting this species. Farmland around the Serengeti erected electric fences in order to stop elephants from stealing their crops, however, unfortunately, they have been having an unintended consequence.

Pangolins need to be able to roam large distances, and they have been regularly being electrocuted. Unfortunately, they roll up in a ball, as a natural reaction to threat, and this has lead to many rolling up around the wire, thereby being electrocuted.

This discovery in 2018 was of a dead pangolin, and as a result, many farmers have changed how their electric fence works to help protect this creature.

There are only thought to be 30-80 pangolins left in the country, but by making these small changes, the few pangolins that remain will be able to thrive, and the population is likely to grow.

This is a pangolin sighting that was filmed on the Massai mara

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Reversing extinction: Marwell zoo and the scimitar-horned oryx

Declared extinct in the wild back in 2000, this species is now not only re-established in the wild, but has a big enough population to now only be listed as endangered (down from critically endangered).

Apart from supplying individuals for the reintroduction, Marwell zoo also helped with strategy.

The video below is just 2 minutes long. While it talks about Marwells other work as well, it shows a number of these animals living wild back in Africa.

This has got to become the reason for zoos. What ever else they do, there are many species at risk of extinction in the wild, these need to have enough captive individuals to re-establish wild populations, should the current conservation fail.

Of course, zoos have many other roles, from education, to fostering a love of wildlife in the next generation.

One thing that they should not be, is a curio house- many zoos are far to worried about displaying albino or melanistic individuals. Now while these individuals are fascinating and can be used as ambassadors for the species, their genetic health should be looked after (all white tigers are descended from one female, and closely related individuals are regularly bred togerther to ensure this trait is passed down. Indeed, as a result of this, white tigers are often not of good health.

The majority of zoos are now like Marwell – while like many, it started as the private zoo of wealthy owners it has turned into an important place of conservation and science. Another of their successes, is the cooperative breeding that occurs as standard in current times, across Europe. Regular loaning of animals is essential, so that we can treat all of the zoo animals in Europe as one single population, thereby  making sure that all animals in the system are healthy.

There are many hundreds of zoos across Europe (some claim as many as 2000, though around 1500 is the estimated worldwide number suggesting that this is a rather large exaggeration. It is likely that around half of the worlds zoos are in Europe, and by cooperative breeding, we can make sure that healthy populations remain in captivity, so that should a population be lost from the wild, it can be returned, when the wild situation improves.

Almost all predictions about human population are expected to peak in the coming decades, and then decline after that. If this pattern is followed, it should be expected that we will need to re-establish wilderness in the future. 

Scimitar-horned oryx have been returned to the wild in Tunisia, and Chad and there are plans to return them to the wild in Niger, in the near future.

Extinction was caused by a variety of features, but the primary one was over-hunting. This has virtually been eliminated, after a ban on hunting of this species was put into effect in 2013. Should this species be allowed to fully recover. In 1985, there was a population of at least 500 of this species living in the wild, so it took only 15 years for it to disappear, as such what is clearly essential is a regular assessment on how this species is faring, allowing earlier interventions.

Saving the natural world, may require this kind of success to be a regular feature.

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