First record of the Yellowish Pipit in Acre with notes on other grassland birds in southwestern Amazônia

This paper presents the first record of the Yellowish Pipit ( Anthus lutescens ) in the Brazilian state of Acre. This record represents the westernmost record of the species in Brazil and provides evidence of its expansion into the southwestern Amazon basin. We also present information on the occurrence of other bird species, typical of grasslands and other open habitats, e.g., the Burrowing Owl ( Athene cunicularia ), the White-tailed Hawk ( Geranoaetus albicaudatus ), the Southern Lapwing ( Vanellus chilensis ) and the Southern Caracara ( Caracara plancus ). These species have encroached southwestern Amazonia following environmental changes caused by human activities, such as the construction of highways and the conversion of the rainforest into cattle pasture. Keywords: Aves, Anthus lutescens , Motacillidae, open habitats, range extension.