What is a species? British bird expert develops a math formula to solve the problem

  • Pensoft Editorial Team
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  • May 10, 2018
  • Nature is replete with examples of identifiable populations known from different continents, mountain ranges, islands or lowland regions. While, traditionally, many of these have been treated as subspecies of widely-ranging species, recent studies relying on molecular biology have shown that many former “subspecies” have in fact been isolated for millions of years, which is long […]

    Feeding strategies in competing hummingbird species observed in a small area in Brazil

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  • May 2, 2017
  • Being the vertebrates with the highest metabolic rate thanks to their rapid wing flaps, the hummingbirds have evolved various types of feeding behaviour. While the nectar-feeders tend to go for food high in energy, strong competition affects greatly their preferences and behaviour towards either dominance, subordination, a strategy known as trapline and a fourth one […]

    The owls beyond the Andes: Divergence between distant populations suggests new species

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  • November 13, 2015
  • They might be looking quite identical, while perched above humanised farmlands and grasslands across several continents, but each of the populations of two owl species, living in the opposite hemispheres, might actually turn out to be yet another kind. This suggestion has been made by Dr. Nelson Colihueque and his team from Universidad de Los […]