Unique nest entrance structure of Partamona helleri stingless bees leads to remarkable crash-landing' behaviour - Shackleton, K; Balfour, N. J; Toufailia, H. A; Alves, Denise de Araújo; Bento, Jose Mauricio Simoes; Ratnieks, F. L. W (Insectes Sociaux, 2019)