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This story appears in the January 2018 issue of National Geographic magazine. For the care and feeding of its offspring, the common cuckoo outsources. When she’s ready to lay an egg, a female Cuculus ...

Languages often co-express related meanings, either reusing words or combining parts of words. It is poorly understood when each strategy is favoured. Across 1,982 languages, Brochhagen et al. find ...

The study of the physiology and ecology of animals that don't have backbones, ranging from worms to sea stars, and of parasites, which can often provide insights into complex ecosystems. (Sea star ...

In the fly gut, stem cells keep the balance of cell types by undergoing eight rounds of cell division to form absorptive cells, then one round to form secretory cells.