5 October 2016 Last updated at 13:16 BST
One of the main threats to these amazing animals is poaching for their ivory tusks.
Every year, tens of thousands of elephants are being killed in this way, with their tusks sold for a large amount of money.
To stop the criminals doing this, the authorities are using a number of tactics. One of these is using specially trained dogs to sniff out and stop poachers in their tracks.
Jenny went to meet some of these talented dogs and spoke to one of their handlers about just how they do it.

The ban, which was proposed by the state's top two associations of traders, came into effect on Wednesday.
The associations say that soft drinks firms take too much water from rivers, leaving farmers struggling to irrigate their land at a time of severe drought.
More than a million shopkeepers are expected to comply with the ban.
Two major trade bodies - the Federation of Tamil Nadu Traders Associations (FTNTA) and the Tamil Nadu Traders Associations Forum (TNTAF) - said they proposed the ban after seeing young people coming out in huge numbers last month against a ban on the local bull-taming festival, jallikattu.
Many who protested against the jallikattu ban said they saw it as an attack on local customs and traditions.
"We started the campaign against soft drinks several months back. But it gained momentum when we extended support to the pro-jallikattu movement," Tha Vellaiyan, president of FTNTA, told BBC Tamil.
"Drinks like Pepsi and Coca-Cola are not good for your health because of their high sugar and chemical content. We are promoting Indian soft drinks, and will encourage better sales of fruit juices," he said.
The associations have also urged supermarkets, restaurants and hotels to follow the ban and "help local businesses and farmers prosper".
Pepsi and Coca-Cola have not commented on the ban.

In Bucharest some protesters broke through police lines and headed towards government buildings.
Prime Minister Sorin Grindeanu says the move would ease overcrowding in prisons.
His critics say he is trying to release allies convicted of corruption.
They also want the proposals to be debated in parliament.
Mr Grindeanu's plan is for the measures to be implemented through emergency decrees that bypass parliament and do not require the signature of President Klaus Iohannis.
Those who would be due for release include several elected officials and magistrates convicted of corruption.
President Iohannis joined protesters in Bucharest on Sunday, saying they were rightly indignant.
"Several political officials who have judicial issues want to change the legislation and weaken the rule of law," he said.
"It is unacceptable to modify the law so that the cases of dozens, even hundreds, of politicians, are wiped out."
President Iohannis was elected in November 2014 and has vowed to stamp out entrenched corruption.
However, the chairman of the ruling Social Democrats, Liviu Dragnea, accused the president of "inciting social disorder and violence" and said the protest was the start of a coup.
A former minister, Mr Dragnea was himself given a suspended prison sentence in 2015 for using bribes and forged ballot papers to influence an impeachment vote in 2012 against then President Traian Basescu.
The number of elephants in the world is in decline.
[NEXT_CONCEPT]
Traders in the southern Indian state of Tamil Nadu have banned the sale of Coca-Cola and Pepsi in favour of local products.
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Tens of thousands of people have taken to the streets of the Romanian capital Bucharest and other cities in protest at government plans to release around 3,000 prisoners.