Category: Chad

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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.

Rock (or cape) Hyrax

Rock or cape hyrax has 5 recognized subspecies, again, unsurprising given its vast range. Generally having a hide within a natural rock cavity, Rock hyraxes are social animals that live in colonies of up to 50 individuals. They sleep in one group, and start the day, warming up in the sun

They are also listed as least concern

As or when we get contacts to see these creatures, they will appear beneath the news section

Manatees and the Dugong

Dogong credit Niklas Findt
Amazon manatee
West african manatee
West Indian Manatee

Dugong and Manatees

The family Sirenia consists of 2 genus, the Dugongidae (only extant species is the Dugong)  and  Trichechidae which contains the 3 Manatee species.

The Dugong is the species in the top left (if you cannot pick it out). The Steller sea cow was a close relation of the Dugong

The big difference, is that unlike Manatees with a paddle shaped tail, where as Dugongs have fluked tails.

As always, as links are made to help with tourism, these will either appear below, or each species will be spun off to have its own page. Ecotourism need not have a big impact on the species and its natural behaviour, however, by giving them financial value to the local population you greatly increase the liklihood of survival as well as increasing the standard of living for local people.

 Should you work in tourism dealing with these species, do get in touch, there is a link at the top of the home page, with a simple form.

Dugong– The only surviving Dugongidae after the stellers sea cow (described in 1741 and hunted to extinction by 1768 for hide meat and fat) was lost.

It is found in the waters of around 37 countries in the Indo-west Pacific. It has recently become functionally extinct in Chinese waters, and may well be lost entirely in the near future. Its thought that while their current range is highly fractured, it is probably still a similar limit to before. These countries between them, give around 140,000km of coastline, and this area maps with where the correct species of sea grasses grow. The worldwide population is thought to have declined 20% in the last 90 years, though this is pretty good compared to many other species.

There are currently thought to be 100,000, with its conservation status being Vulnerable

Amazonian Manatee-Found in parts of the Amazon basin, throughout parts of Brazil, Colombia Peru and Ecuador.

It is the smallest of the surviving Manatees. Weights fall between 7,5kg and 350kg, with a 75cm-225cm length.  Given that it is likely decreasing, it is going to be below this now.

They are exclusively herbivorous, feeding on water lettuce and hyacinth. During a day, they can consume around 8% of their bodyweight. This mostly occurs during the wet season, during the dry season they return to the main river and survive on their fat reserves. They have a prehensile snout (like a less developed trunk) for feeding

They are considered Vulnerable, with the last count giving an upper limit of 10,000, however, this was in 1997. 

West-Indian manatee- So named,  because they were first sighted amongst a group of Islands called the West-Indies in the Caribbean – it is no-where near India (as you can see).  They live in shallow coastal areas. They have a prehensile snout (like a less developed trunk) for feeding. Unlike elephants, they are not limited to 6 sets of teeth, but only having molars (24-36) it is a simpler layout. As their range includes Florida (well known from the Everglades) this species is well known in places. They are hard to count, living in murky water,

Listed as vulnerable, the whole population is not thought to be greater than 10,000. The 2 subspecies are the Florida manatee (around 2500) and the Antillean Manatee which is found off the Atlantic coast of Mexico and central south America (particularly in the waters of greater Antilles) potentially, historically found along the coast of Texas (and as far north as Dennis, Tennessee).

African Manatee- (or West African Manatee) Although found both on the coast and inland, there is no significant genetic difference between these populations. African Manatees can be found in West African regions which include a wide range of countries – requiring cross nation action to save them. Manatees are found in brackish waters to freshwater: in oceans, rivers, lakes, coastal estuaries, reservoirs, lagoons, and bays on the coast.

The areas with the highest manatee populations are Guinea-Bissau, the lagoons of Côte d’Ivoire, the southern portions of the Niger River in Nigeria, the Sanaga River in Cameroon, the coastal lagoons in Gabon, and the lower parts of the Congo River. Alone amongst manatee species, the African manatee is Omnivorous, eating clams and molluscs as well as fish found in nets (can make up 50% of diet). They are more adaptable than other manatees, being able to survive in salt water (though they need access to fresh water to drink).

They are nocturnal, but many countries, a dead manatee is worth a lot to hunters. They are listed on CITES Appendix 1 with a population under 10,000. Cote d’Ivoire has a population of 750-800. Some of the biggest populations still live in Gabon, status is unknown in many areas. There is much tourism potential – worth a lot in Florida.

 

Common Hippopotamus

Common Hippopotamus

Hippopotamus are a fascinating animal. Large, highly aggressive, and spending most of their days in water. For many people, their memory of a Hippopotamus on safari (or in a zoo) is a pond with a grey bump in the middle. But there is far more to a hippopotamus than meets the eyes. Duromg the night, Hippo leave the safety of the water and go into the bush to graze.

They are incredibly dangerous, and there is a far higher risk for people wandering in the bush to be killed by hippo than anything else. In the past, they were one of the few species that still lived in significant numbers outside reserves. Unfortunately, as the human population of Africa has grown, the majority of these free roaming Hippo have been killed – for an African living on a tiny income, a hippo is a huge pile of meat, which can be sold, and some of its teeth are made of ivory.

A rough estimate suggests that the meat is worth around 8000. When you add in the Ivory teeth, it is possible for a Hippo carcass to be worth a years average salary (and that is the mean salary). 85% of Africans survive on $5.50 per day, which works out at almost exactly $2000 – so for 85% of Africans, a hippo carcass is worth 4 years of salary – assuming that you do not make much money from the ivory, and it would not be surprising if this added significantly.

When you look at these numbers, it is not surprising that people poach Hippos -and it makes it very hard to work out how to save them.

Of course, Hippo can be worth far more in tourism dollars over their lifespan.

Common hippopotamus are possible to see in all the Savannahs that we have listed so far. Visit wild places to see the total list.

Below is links to some of the biggest (though as I say, hippo can often be seen in small reserves and in places outside reserves as well. All our savannah wild places have sizable populations of common hippopotamus.

Limpopo transfrontier
Okavango delta (part of KAZA transfrontier park)
Serengeti from above
See Animals Wild