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A female Black-throated Mango (Anthracothorax nigricollis) squeezing her tongue after feeding from a flower – an action that prepares the tongue's grooves for elastic expansion to rapidly collect nectar (Finca el colibrí gorriazul, Fusagasugá, Colombia). Photo credit: Dr. Kristiina Hurme. See the paper ‘Hummingbird tongues are elastic micropumps’ by Alejandro Rico-Guevara et al., published in Proceedings B.