I am the official currency of a nation known for its unique biodiversity and being the only country with a predominantly Dutch-speaking population in South America. My banknotes often feature local flora and fauna. What am I?

1. My country is located on the northeastern coast of South America.
2. My value is pegged to the US dollar, reflecting economic ties.
3. My history includes being under Dutch colonial rule.
4. You might see images of tropical birds and animals on my bills.