Niue, a sovereign state in free association with New Zealand, uses two official legal tender currencies. The New Zealand Dollar is the circulation currency for daily transactions, while the government also authorises legal tender coins in the Niue Dollar currency for collector's purposes.
A number of mints issue a large variety of commemorative, bullion and collector coins under the authority of Niue. These coins are dedicated to historical or general popular culture themes not related to Niue itself. Many of them are in standard bullion sizes - typically, one ounce of silver (abbreviated as 1 oz Ag, where "Ag" comes from the Latin word for silver, Argentum). Many of these feature various animals.
This coin is the fourth issue in the Endangered Species series by the New Zealand Mint and features the Mountain Gorilla.
The Mint says about it:
"This impressive engraved 1 oz Silver coin from New Zealand Mint features a pensive Mountain Gorilla standing by a lake. Today, it is estimated that there are only 700 Mountain Gorillas remaining on Earth. These live at altitudes of up to 4,000 m in the mountains of Rwanda, Uganda, and the Democratic Republic of Congo.
As humans have moved into the Gorillas’ territory, they have been pushed further up into the mountains, forcing them to endure deadly conditions. This is the fourth release in the Endangered Species coin series by New Zealand Mint and has a limited mintage of only 2,000 coins." | 
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