Adaptive function of tusk: hyperallometric scaling suggests that tusk length is an exaggerated trait under sexual selection.
📄 Graham et al. (2020) The longer the better: evidence that narwhal tusks are sexually selected. Biology Letters 16:20190950

Is the of driven by neurobiological or cultural constraints? An analysis based on the comparison of 2474 languages reveals that emotion words vary in meaning across languages, but some general trends are conserved between geographically distant cultures.
📄 Jackson et al. (2019) Emotion semantics show both cultural variation and universal structure. Science 366:1517–1522

Recurring selective pressure during annual is necessary to maintain migration-associated adaptations in .
📄 Tenger-Trolander et al (2019) Contemporary loss of migration in monarch butterflies. PNAS 201904690

90 years old and still snappy. A vivid interview with the “intellectual grenade thrower” ecologist and evolutionary biologist, Ed. O. Wilson. He has challenged well-established dogmas, he has expressed many controversial views, he was even arguably wrong several times, but what an inspiration for generations of ecologists!

Searching for a good non-technical introductory book about human population ? The 2017 book by Adam Rutherford is rich in anecdotes, very entertaining, lively, and written in an engaging style. I greatly enjoyed reading it.
📄 Rutherford A (2017) A brief history of everyone who ever lived: the human story retold through our genes. The Experiment, New-York

Superbly illustrated review about anti-predator strategies in anurans.
📄 Ferreira (2019) Behavioral Ecology and Sociobiology 73:69

The of in still a major topic in behavioural . Here is a nice experimental and theoretical study in showing that indiscriminate possibly evolved when kin discrimination is prone to error, mean among social partners is high, and the relative benefits of helping are large.
📄 Duncan et al. (2019) American Naturalist

mating (partners resemble each other) is a central question in evolutionary biology. A meta-analysis in species reveals that such a pattern may be less common than previously thought, mainly due to publication bias.
📄 Wang et al. (2019) Scrutinizing assortative mating in birds. PLoS Biology 17:e3000156

Ultrasonic signal emitted by a toxic to prevent predation by .
📄 O'Reilly (2019) Deaf moths employ acoustic Müllerian mimicry against bats using wingbeat-powered tymbals. Scientific Reports 9:1444

of : evidence for innate sense of collaboration and indebtedness, distinct from or in-group favouritism may explain the emergence of and in Human.
📄 McGrath & Gerber (2019). Experimental evidence for a pure collaboration effect. Nature Human Behaviour

Birds prefer parent lookalikes as mates: sexual in wild populations by the legendary evolutionary biologists Rosemary and Peter Grant.
📄 Grant & Grant (2018) Role of sexual imprinting in assortative mating and premating isolation in darwin's finches. Proceedings of the National Academy of Sciences 115:E10879-E10887

Peep show experiments investigating cultural transmission in fly. Almost seven years of hard work and a beautiful paper by Etienne Danchin and Guillaume Isabel from Toulouse.
📄 comment:

Darwinian medicine and new views on or : genes formerly linked to higher fitness now predispose to non-communicable diseases.

📄 Corbet et al. (2018). The transition to modernity and chronic disease: mismatch and natural selection. Nature Reviews Genetics

Improve ecological literacy: a selection of 100 papers, and still on top!
Courchamp, F. and Bradshaw, C. J. A. 2018. 100 articles every ecologist should read. Nature Ecology and Evolution 2:395-401
See also, the responses to this subjective and partial list as regards possible , and editiorial .

Congratulation to Christelle Couchoux: her master research project is published in the last issue of Animal Behaviour.

Couchoux et al. 2018. Male Gammarus roeseli provide smaller ejaculates to females infected with vertically transmitted microsporidian parasites. Animal Behaviour 137:179-185

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