Tag Archives: Extinction

Giraffes: The Massive Extinction that Nobody Knows

A Beloved Animal Lost Forever

Source: David Orgel, Giraffe, 2006. https://www.flickr.com/photos/orgel/2208083592/. All Creative Commons.

When most people think of the African Savanna, they imagine a beautiful grassland filled with lions, elephants, zebras, cheetahs, and, of course, giraffes. But what if I told you that giraffes are going extinct?

In the past three decades, the giraffe population has fallen by an enormous 40%. Currently, there are less than 100, 000 left in the world, and what few do remain, exist in vulnerable and fragmented herds, facing constant threats from habitat loss and poaching.

Giraffes overall are only categorised as a vulnerable species – meaning they are in threat of extinction for the not-immediate, but foreseeable future. However, scientists agree that giraffes are indeed endangered and face imminent extinction if nothing is done.

These numbers only get more daunting when looking at the individual subspecies. Two of the nine subspecies – Kordofan and Nubian giraffes –  are considered critically endangered with population decreases of 90% and 98%, respectively. Similarly, the Reticulated Giraffe is considered endangered – a step up from critically endangered but still facing immediate extinction. Startlingly, the West African Giraffe was saved from the brink of extinction with only 49 members still living in the 1990’s. Today the West African Giraffe has been moved to the vulnerable category despite only having 600 members total in its population.

The most heartbreaking part of this story is that the reason for this drastic decline is entirely man-made. Experts say that what is driving this beautiful species to extinction is the combined effects of habitat loss and poaching.

Source: Frapelo, Giraffe, 2009. https://www.flickr.com/photos/frapelo/3823053523/. All Creative Commons.

The encroachment of humans onto giraffe zones has begun to drive out the animals from their natural habitat, and this new contact between giraffes and humans has been harmful to both species. Giraffes have been known to die in car accidents or starve from loss of food sources.

On top of this, many poachers have been killing these protected animals for their hides, meat, and bones, making luxury crafts or medicines from the various parts. Some giraffes are even being killed for their tails alone, which are seen as a status symbol.

Thankfully, there is some hope. Conservationists have been working tirelessly to save each of these subspecies, and so far, they have been successful in this tiresome fight. However, education needs to be there.

Source: Lisa, Giraffe, 2005. https://www.flickr.com/photos/ljb/32340548/. All Creative Commons.

Most people are aware of the extinction faced by elephants, rhinoceroses, and other megafauna, largely due to the media attention those cases receive. Giraffes, on the other hand, have not received that same kind of media highlighting, resulting in what some are deeming a “silent extinction”. Experts say this is because of the common misconception that because an animal is often seen in zoos and sanctuaries, it must be under no threat in the wild. In fact, there are fewer giraffes than there are elephants.

Through awareness and understanding, groups like the Natural Resource Defense Council (NRDC) have managed to put in place policies protecting giraffes. Through more efforts, we may be able to see this species safe and stable.

 

Written by Kaitlyn Le

Bringing Back the Dinosaurs

In November of 2018, Chinese CRISPR researcher He Jiankui sparked international outrage after announcing his experiment to create genetically modified twins using CRISPR. Despite what this event may seem to say about Chinese research ethics, China actually has strict regulations put in place to prevent incidents like these from occurring. They are also at the forefront of CRISPR research, using the genome editing tool in the agricultural industry to efficiently feed their massive population with restricted resources and space. The technology used in the twin experiment is also nothing new and mysterious. CRISPR is a well researched natural defense tool discovered back in 1993.

CRISPR, which stands for “clustered regularly interspaced short palindromic repeats”, uses a guide RNA to guide a separate piece of DNA to a specific target in the genome of a cell, where the Cas9 enzyme cuts the current DNA in place. The cell’s natural DNA repair machinery then heals the cut area with the DNA bound to the guide RNA, implementing the DNA into the genome. While there are other methods to edit the genome, CRISPR is relatively cheap, safe, and specific to it’s target.

The cause for concern should not be how little we know about this tool, but instead for how well we know it’s potential. The same tool that helps China grow better crops can also bring back the woolly mammoth or dinosaurs back from extinction. By extracting DNA from bones and other remains of extinct animals, Many species have had their genomes partially sequenced. These genomes can be cut and pasted into living animal cells, to bring about a new hybrid species with traits like the extinct species. Theoretically with a completely mapped genome, the extinct species can be brought completely back to life.

While it seems like a good idea to bring back certain extinct species, we should consider the effect it will have on our current ecological systems. These species were adapted to live in an environment from their time, but we now have different ecological ranges. We should also consider the factors that led to the extinction of that species. What measures will be put in place to prevent their extinction this time around, and what effect will the revival have on current species biodiversity?