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The black-footed ferret is North America's rarest mammal, with only about 300 estimated to survive in the wild at the end of 2015. The species has been listed as endangered since 1967, and its survival is closely tied to prairie dogs, which provide almost all of its food as well as the burrow systems the ferrets use for shelter.

Avocados growing in Nicaragua may carry a remarkable record of ancient human migration across the Americas. A new study published in 'Plants, People, Planet' has found that several avocado varieties growing in Nicaragua are genetically distinct from the commercial varieties commonly found today and are more closely related to avocado populations from South America.

A 236-million-year-old fossil from Argentina may have provided the earliest evidence yet that an animal on the evolutionary lineage leading to mammals gave birth to live young rather than laying eggs. The research study published in the 'Frontiers', analysed the bones of 'Chiniquodon theotonicus,' a dog-sized carnivorous cynodont that lived during the Late Triassic.