Carl Hieronymus Euler was a Swiss

Switzerland

Switzerland name of one of the Swiss cantons. ; ; ; or ), in its full name the Swiss Confederation , is a federal republic consisting of 26 cantons, with Bern as the seat of the federal authorities. The country is situated in Western Europe,Or Central Europe depending on the definition....

 farmer and amateur ornithologist.

Euler was born in Basel

Basel

Basel or Basle In the national languages of Switzerland the city is also known as Bâle , Basilea and Basilea is Switzerland's third most populous city with about 166,000 inhabitants. Located where the Swiss, French and German borders meet, Basel also has suburbs in France and Germany...

. In 1853 he travelled to Rio de Janeiro

Rio de Janeiro

Rio de Janeiro , commonly referred to simply as Rio, is the capital city of the State of Rio de Janeiro, the second largest city of Brazil, and the third largest metropolitan area and agglomeration in South America, boasting approximately 6.3 million people within the city proper, making it the 6th...

 and bought a farm near Cantagalo. He became Swiss vice-consul, and in his spare time collected birds and studied their habits. His findings were published in the Journal für Ornithologie between 1867 and 1893. He sent his specimens to the Berlin University Museum, where Jean Cabanis

Jean Cabanis

Jean Louis Cabanis was a German ornithologist.Cabanis was born in Berlin. He studied at the University of Berlin from 1835 to 1839, and then travelled to North America, returning in 1841 with a large natural history collection. He was assistant and later director of the Berlin University Museum,...

 named the Euler's Flycatcher

Euler's Flycatcher

Euler's Flycatcher, Lathrotriccus euleri, is a small passerine bird in the tyrant flycatcher family. It breeds in South America east of the Andes from Colombia and Venezuela south to Bolivia and Argentina, and on the islands of Trinidad and formerly also Grenada...

Lathrotriccus euleri after him.