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Open research questions in Animal Behavior and Reproduction

248 unresolved questions extracted from the limitations and future-work sections of 1,148 Animal Behavior and Reproduction papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • Extreme sexual size dimorphism (SSD) represents one of the most striking forms of phenotypic divergence between the sexes, yet the genomic basis of extreme body-size dimorphism remains poorly understood.

    Evolutionary and multi-omic divergences associated with the extreme sexual size dimorphism in spiders · 2026 · DOI

  • While many studies have documented mate copying in Drosophila melanogaster and its potential for cultural evolution under laboratory conditions, little is known whether this behavior is universal among other drosophiliids.

    Does mate copying occur in Drosophila hydei ? · 2026 · DOI

  • In birds, some of the families with the most elaborate plumage and display-such as birds of paradise, manakins, and cotingas-are also specialist frugivores, yet links between shifts in diet, changes in breeding system, and the evolution of elaborate traits are poorly understood.

    Genomic and physiological changes in a sexually selected and frugivorous bird radiation · 2026 · DOI

  • However, little is known if groups also amplify maladaptive information such as false alarms and whether such costs reduce possible benefits.

    Better and faster decisions by larger fish shoals in the wild · 2025 · DOI

  • 1 , 2 , 3 , 4 , 5 However, how signal dynamics guide mate choice remains poorly understood.

    Dancing male riflebirds create a dynamic sensory trajectory that guides female choice · 2025 · DOI

  • Animals interact with unfamiliar objects to learn about their properties and guide future behavior, but the underlying neurobiological mechanism is not well understood.

    Drosophila learn to prefer immobile spherical objects through repeated physical interaction · 2025 · DOI

  • While a relationship between the feathers elaborate features and mating success has been shown in some studies, what features of the train females are attracted to remains controversial.

    A long tail of truth and beauty: A zigzag pattern of feather formation determines the symmetry, complexity, and beauty of the peacock’s tail · 2025 · DOI

  • Multimodal signaling, the use of multiple sensory systems is crucial in this process, but little is known about the relative importance of different senses used during aggression.

    The Role of Visual and Chemosensory Signals in Male–Male Aggression of the Cichlid Astatotilapia burtoni · 2024 · DOI

  • However, female somatic reproductive tissues remain understudied, hindering insight into the molecular interactions that support fertility.

    Regional specialization, polyploidy, and seminal fluid transcripts in the Drosophila female reproductive tract · 2024 · DOI

  • Despite a large body of evidence in theoretical and laboratory settings, the potential for evolutionary rescue to be a viable adaptation process for free-ranging animals remains unknown.

    Increasing environmental variability inhibits evolutionary rescue in a long-lived vertebrate · 2024 · DOI

  • Little is known about the way in which female sperm storage organs provide an environment conducive to sperm survival.

    Three-dimensional correlative microscopy of the Drosophila female reproductive tract reveals modes of communication in seminal receptacle sperm storage · 2024 · DOI

  • These social interactions produce the coordinated movements of bird flocks and fish schools, but little is known about their developmental emergence and neurobiological foundations.

    Development of neural circuits for social motion perception in schooling fish · 2024 · DOI

  • Spiders have up to four pairs of eyes whose sizes vary dramatically, but their ontogenetic, static, and evolutionary allometry has not yet been studied in a comparative context.

    Allometry and ecology shape eye size evolution in spiders · 2024 · DOI

  • nigoni, we show that female chemotaxis to males is limited to adult females approaching adult or near-adult males and relies upon the AWA neuron-specific transcription factor ODR-7, as does male chemotaxis to female odor as previously shown in C.

    Evolution remodels olfactory and mating-receptive behaviors in the transition from female to hermaphrodite reproduction · 2024 · DOI

  • Prior studies have uncovered tactile-responsive areas within the avian telencephalon, particularly in pigeons, 3 , 4 , 5 , 6 parrots, 7 and finches, 8 but variations in somatosensory maps and responses across avian species are not fully understood.

    Variations in touch representation in the hummingbird and zebra finch forebrain · 2024 · DOI

  • The evolution of traits influencing ontogeny is a complex problem that involves understanding the fitness effects of these traits across an individual's lifetime. Prior work has focused on the evolution of traits in unstructured populations or has assumed that the fitness effects of traits are constant across an individual's lifetime.

    Directional and disruptive selection in populations structured by class and continuous ontogeny under incomplete plasticity · 2026 · DOI

  • The model incorporates size-matching sexual selection (eq. 32) but assumes males only benefit from matching female size and do not experience viability costs from growth. Relaxing this assumption to include trade-offs between male growth investment and survival would require reformulating the male fitness function and determining how such costs alter convergence stable strategies and polymorphism conditions.

    Directional and disruptive selection in populations structured by class and continuous ontogeny under incomplete plasticity · 2026 · DOI

  • Future research should apply the paper's framework to a variety of contexts. Future research should evaluate the fitness consequences of TGP in populations under environmental change. Future research should investigate the mechanisms underlying transgenerational phenotypic plasticity.

    A selection-based framework for evaluating transgenerational phenotypic plasticity under environmental change · 2026 · DOI

  • The paper identifies a gap in the evaluation of the fitness consequences of transgenerational phenotypic plasticity. The paper argues that prior work has often over-interpreted intergenerational phenotypic responses as evidence of resilience. The paper notes that a more agnostic null hypothesis is required when evaluating the fitness consequences of TGP.

    A selection-based framework for evaluating transgenerational phenotypic plasticity under environmental change · 2026 · DOI

  • The need for a framework to understand and predict AI behavior - The lack of a coherent first-principles foundation for understanding AI behavior

    Because Definitions Matter: A Reader's Guide to the Applied Evolutionary Ethology Paper Series · 2026 · DOI

  • Although the LHRH challenge was inconclusive for androgens, our results provide useful technical details for measuring glucocorticoid metabolites in common waxbill excreta.

    Measurement of excreted steroid metabolites in common waxbills Estrilda astrild · 2026 · DOI

  • Future research could investigate the neural mechanisms underlying the decoy effect in zebrafish. Future research could test the decoy effect in other non-human animals. Future research could investigate the implications of the decoy effect for conservation strategies.

    Sex and Order of Presentation Influence the Decoy Effect in Shoal Size Preference Task in Adult Zebrafish · 2026 · DOI

  • There is a lack of research on the decoy effect in non-human animals. There is a lack of research on the cognitive biases that influence decision-making in zebrafish. The study addresses the gap in our understanding of the decoy effect in zebrafish.

    Sex and Order of Presentation Influence the Decoy Effect in Shoal Size Preference Task in Adult Zebrafish · 2026 · DOI

  • The high remating rate in this species may affect the interpretation of results. The limited duration of observations may not capture the full range of reproductive tactics. The use of machine-learning-based methods requires careful validation.

    Condition-dependent success of resource-based reproductive tactics across both sexes in Drosophila prolongata · 2026 · DOI

  • Further investigation of the prevalence of size-disassortative mating patterns over longer time scales is needed. Studies of other species with similar mating systems could provide insights into the generality of the results. The development of new methods for studying animal behavior could provide further insights into reproductive tactics.

    Condition-dependent success of resource-based reproductive tactics across both sexes in Drosophila prolongata · 2026 · DOI

Most-cited papers in Animal Behavior and Reproduction

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248 open questions have been extracted from the limitations and future-work passages of 1,148 Animal Behavior and Reproduction papers in our library. Each one below links back to the study that raised it, so you can read the original claim in context.

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