The Tuvaluan Dollar is the currency of Tuvalu - a small nation in the Pacific Ocean. Tuvalu has never had banknotes of its own, and has been issuing coins since 1976; these circulate together with coins of the Australian Dollar, which is also legal tender in the country, and to which the Tuvaluan Dollar is pegged.
The Australian Perth Mint issues a large variety of non-circulating legal tender (NCLT) coins under the authority of Tuvalu. Some of these are in the one dollar denomination, and have the same specifications that the mint uses for its large non-circulating Australian dollar range; these are larger than the normal circulating dollar coins.
This coin is part of the Forever Love gift range by the Perth Mint which has a different design every year, and features two cockatoos.
The Mint says about it:
The coin features one of Australia’s most beautiful birds, the Major Mitchell Cockatoo. Representative of true love and companionship, these adorable creatures mate for life and can live for decades. | 
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