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Migration and reproduction are energetically expensive processes that migratory animal species must confront during their life-cycle. The relationship between hematocrit and mass in birds highlight their ability to invest energy in activities such as reproduction and migration and face costs...
Tyrannus dominicensis, a boreal migrant from the northern hemisphere, was observed and photographed in an área of “terra firme”, at Tefé, Amazonas state, substantiating the presence of this species in the state. This is the southernmost record of the Grey Kingbird in Brazil.
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