Carl Euler
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Carl Hieronymus Euler (1834 - 1901) was a Swiss farmer and amateur ornithologist.
Euler was born in Basel. In 1853 he travelled to Rio de Janeiro 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 named the Euler's Flycatcher Lathrotriccus euleri after him.