Cross river Gorilla – See Animals Wild

Primate family tree main and great and lesser apes

Primate family tree

Great apes

Lesser apes

The primates are in some ways one of the most successful families. It is true that many are now endangered, however, unfortunately, that is as a result of the run-away success of the most successful member of the primate family us! Having left the rainforests behind, we have been reducing their coverage dramatically over the last few centuries.

The sad thing, is that while we have pushed many of our closest cousins towards extinction, the loss of forests may well cost us dearly in the future as well. As a species, we need to pull together to meet this challenge. in order to jump to the various families, click on the family of interest above – though all can also be reached by scrolling down.

Great Apes

Eastern Lowland gorilla

Mountain Gorilla

Western lowland gorilla

Cross river gorilla

Great ape Family split is thought to have split from its nearest relative – the gibbon family, around 17 million years ago.

4 million years later the Orangutan family split from the gorilla line and the human/chimp line.

3 million years after this (so around 10 million years ago) the gorilla family split from the Homo (humans) and Pan

Finally the human line (homo) split from the Pan line 5-6 million years ago.

It should be noted, that chimpanzees and Bonobos split from a common ancestor just 1.8 million years ago. This occurred as the two populations ceased to be able to have contact with each other – the Congo rive formed between 1.5 and 2 million years ago.

For more information on each species, click on their photo and this will take you to their page

It should be noted that while I have grouped eastern western and skywalker gibbon together, there is some contention that the skywalker gibbon should be in its own genus, having diverged around half a million years aog

Gibbons

siamang gibbon genus Symphalangus

hookock gibbon (Eastern, Western and Skywalker) Genus Hoolock

genus Normascus (crested gibbon)

Genus Hylobates (dward gibbons) Agile gibbon

Genus Nomascus

This family is the Genus: Nomascus or crested gibbon.

Black crested gibbon

Eastern black crested gibbon

Hanain black crested gibbon

Northern buffed gibbon

Norhtern white cheeked gibbon

Southern white cheeked gibbon

Yellow cheeked gibbon

The last Genus of gibbons is Hylobates: dwarf gibbons.

Abbots (Western) grey gibbon

Agile gibbon

bornean white bearded gibbon

Eastern grey gibbon

kloss gibbon

lar gibbons male and female

Mullers grey gibbon

Pileated gibbon

Silvery gibbon

May 15, 2022October 21, 2023

Species Watch: Cross river gorilla and western lowland gorilla

The cross River gorilla (picture above) is a critically endangered subspecies of the Western lowland gorilla species. The cross River gorilla are scattered in at least 11 groups across the lowland montane forests and rainforests of Cameroon and Nigeria, an area of 3,000 square miles, or a little smaller than Puerto Rico. There are only 200-300 that remain of this subspecies.While there are some physical traits that are different between these species, the cross River gorilla has become a Highland specialist. Although known to have interbred in the past, genetic analysis suggests this stopped more than 400 years ago. Changes in climate may well have been the catalyst to stop the interbreeding.

In this way, the cross River gorillas and the mountain gorillas have similar habits and ecosystem niches. In this way, it could be suggested that cross River gorillas are simply 50 years behind mountain gorillas in the sense that 40 years ago, there were only around 250 mountain gorillas – this population has increased to over 1000, so clearly it isn’t too late for the cross River gorillas numbers to recover.

Could a similar recovery take place? Perhaps following the pattern set up by Diane Fossey for tourism of the mountain gorillas, might work?

Western lowland gorillas have a wild population in a fast healthier position, with an estimated 100,000 remaining. Unfortunately though, this is a very tough estimate as they live in some of the hardest to reach jungles so an accurate count is hard. It is however, thought that this gorilla population has seen a 60% reduction over the last 10-25 years. It is thought that if the pressures of placing and diseases were removed this population would recover in about 75 years (of course these pressures are unlikely to disappear, and with the loss of rainforest there may be nowhere for these gorillas to live if they did recover.

Western lowland gorillas are closely related to cross river gorillas, in the same way that eastern lowland gorillas are closely related to mountain gorillas. However, retaining these different subspecies is highly important as they are adapted to the different conditions where they live.

It is unfortunate that there is little positive news on either of these species at the current time, but many people are working on it.

February 25, 2022June 28, 2022

Are the days of the Nigerian gorilla numbered?

Nigeria was once a wildlife rich country. Unfortunately as a country whose population has soared over the last few decades much of the wilderness has been lost.

Afi River forest reserve in the eastern Nigeria cross river state is an forest corridor which connects small fragments of remaining gorilla habitat. However, this may well cease to be the case in the near future, as satellite data has shown significant deforestation in this area. The problem with forest corridors, is that they do not tend to be particularly wide – which means relatively small levels of deforestation can disconnect one end from the other.