Dream in Octopus? exhibits active states with colour changes and rapid eye-movements which may indicate . Don't miss the nice videos of sleeping octopuses.
📄 Medeiros et al (2021) Cyclic alternation of quiet and active sleep states in the octopus. iScience dx.doi.org/10.1016/j.isci.2021

Science is not always theory driven. Purely descriptive studies can be fascinating too. Here is a collection of videos illustrating extremely rare behaviours in the including egg laying by the queen and brood care by workers. I have spent years working on bees, and I've never seen such a thorough work.
📄 Siefert et al (2021) Honey bee behaviours within the hive: Insights from long-term video analysis. PLoS ONE 16:e0247323 dx.doi.org/10.1371/journal.pon

The regulation of division of labour in social insects is poorly understood. One can still find, in many textbooks, old models about "age polyethism". Here is a nice experimental work in which the behaviour of workers were continuously tracked for 5 months. The transition between nurse to forager tasks is largely age independent.
📄 Richardson et al. (2021) Current Biology 0 dx.doi.org/10.1016/j.cub.2020.

📄 Hughes et al (2021) Teaching animal behavior online: A primer for the pandemic and beyond. Ethology 127:14–31 dx.doi.org/https://doi.org/10.

Red squirrels may have found the fountain of youth: keeping the same neighbors over time.
📄 Chaine (2021) Social evolution: big benefits of BFFs. Current Biology 31:R72–R74 dx.doi.org/10.1016/j.cub.2020.

Ok, it's on twitter, but I am looking forward to reading some talks in this online scientific on animal behaviour.
🔗 animbehav2021.org/

Nice experimental design using artifact to study mating preference in .
📄 Romano & Stefanini (2021) Bio-robotic cues show how the Trinidadian guppy male recognises the morphological features of receptive females. Behavioural Processes 182:104283 dx.doi.org/10.1016/j.beproc.20

How to appear bigger than you are? Male tree crickets use home-made baffle as sound-amplifier when communicating with females.
📄 Deb et al (2020) Baffling: a condition-dependent alternative mate attraction strategy using self-made tools in tree crickets. Proceedings of the Royal Society B: Biological Sciences 287:20202229 dx.doi.org/10.1098/rspb.2020.2

Know your enemy: snapping assesses recent victory history of their opponents before engaging in a fight against them.
📄 Dinh et al (2020) Winner effects and switching assessment strategies facilitate fast and frugal decisions in territorial contests. Animal Behaviour 170:189–205 dx.doi.org/10.1016/j.anbehav.2

Unusual case of acoustic batesian in spider species which mimics stridulation against predator.
📄 Pekár et al (2020) Spiders mimic the acoustic signalling of mutillid wasps to avoid predation: startle signalling or Batesian mimicry? Animal Behaviour 170:157–166 dx.doi.org/10.1016/j.anbehav.2

Evidence of in a tiny parasitoid , half millimetre long. Congratulation to Silene for this nice study.
📄 Lartigue et al (2020) Consistent variations in personality traits and their potential for genetic improvement of biocontrol agents: Trichogramma evanescens as a case study. PCI Ecology dx.doi.org/10.1101/2020.08.21.

Fecal defence: while otherwise very careful about the colony cleanliness, some bees spread bird or mammal on their hive as a defense against predator wasps.
📄 Mattila et al. (2020) Honey bees (Apis cerana) use animal feces as a tool to defend colonies against group attack by giant hornets (Vespa soror). PLoS ONE 15:e0242668 dx.doi.org/10.1371/journal.pon

Grany cure in a species: russet sparrows incorporate fresh medical herb in their nest as anti-parasite treatment.
📄 Yang et al. (2020) Sparrows use a medicinal herb to defend against parasites and increase offspring condition. Current Biology 30:R1411–R1412 dx.doi.org/10.1016/j.cub.2020.

Collective decision and wisdom of the crowd: new considerations about the jury theorem in natural condition.
📄 Winklmayr et al (2020) The wisdom of stalemates: consensus and clustering as filtering mechanisms for improving collective accuracy. Proc R Soc Lond B 287:20201802 dx.doi.org/10.1098/rspb.2020.1

Fossil behaviours: towards behavioural .
📄 Hsieh & Plotnick (2020) The representation of animal behaviour in the fossil record. Animal Behaviour 169:65–80 dx.doi.org/10.1016/j.anbehav.2

Closing time effect: towards the end of the mating season, your acceptance threshold decreases (or the partner's attractiveness increases). Congratulation to Louise for this nice theoretical analysis.
📄 Chevalier et al (2020) Fluctuating dynamics of mate availability promote the evolution of flexible choosiness in both sexes. American Naturalist dx.doi.org/10.1086/711417

composition determines social learning pathways within shoaling .
📄 Hasenjager et al (2020) Proceedings of the Royal Society B: Biological Sciences 287:20201871 dx.doi.org/10.1098/rspb.2020.1

Effects of climate change on the incubation behaviour in nesting shorebirds. Incubation strategy modulates the trade-off between incubation and foraging.
📄 Meyer et al. (2021) Behavioural responses of breeding arctic sandpipers to ground-surface temperature and primary productivity. Science of The Total Environment 755:142485 dx.doi.org/10.1016/j.scitotenv

Looking for a good book about game theory in biology? This is surely an excellent introduction by some of the most influential theoreticians in behavioural ecology.
📄 McNamara & Leimar (2020) Game theory in biology: concepts and frontiers. Oxford University press, Oxford, UK global.oup.com/academic/produc

Mike Tyson effect in social insect: wasps rely on public information to assess their opponent's strength before engaging in a .
📄 Tibbetts et al (2020) Wasps use social eavesdropping to learn about individual rivals. Current Biology dx.doi.org/10.1016/j.cub.2020.

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