Nombre de vues : 3 667 Flies of the Diopsidae family have the amazing feature of having their eyes positioned at the tip of outgrowths called ocular peduncles located on each side of the head. This morphology of hypercephalization and lateralisation of the visual system is also found in vertebrates, where the best known case is…
Nombre de vues : 1 741 One of the most universal needs of animals is to understand the environment in which they live to move in complex and diverse environments in search of congeners, to flee predators or capture prey. The acquisition of information can be done in various ways with the senses of hearing, touch,…
Nombre de vues : 2 661 Mushroom ants have the particularity of feeding exclusively on a Basidiomycete fungus, which they grow on a substrate fed by the collection of pieces of plants (leaves, flowers, fruits) (video at the bottom of page). The two species have maintained a symbiotic mutualist relationship of total interdependence in co-evolution for…
Nombre de vues : 4 351 Anatomical structures whose role is venom injection have appeared independently in several orders of arthropods. They can thus be found in Chelerates (scorpions and spiders), Myriapods (millipedes), or insects such as Hymenoptera (wasps, ants and bees) and ant larvae (Nevroptera). These organs are used either for predation or defense purposes….
Nombre de vues : 3 400 Cockroaches, termites and mantis, despite obvious morphological and behavioural differences, share a common ancestor and belong to the order Dictyoptera. The small quantity of fossils available and their little exploitable state, make the understanding of their evolutionary history difficult and complex. Many uncertainties and controversies remain regarding the phylogeny of…
Nombre de vues : 2 034 In the Arctic and subarctic regions, living organisms must, during winter, survive extreme temperatures sometimes reaching -60°C. There are two strategies for this: Protect from the cold to avoid freezing and thus cell death (increased water volume during freezing), which mammals, birds and other reptiles do for example Be frost…
Nombre de vues : 4 002 Color is not an intrinsic characteristic (own to) of living objects and organisms. It depends on the type of receivers and the information processing process of the viewer. Indeed, a poppy, which we see red, will be perceived differently by a bee which does not perceive the wavelengths corresponding to…
Nombre de vues : 2 062 Threatened, the bombardier beetles spray from their abdomen an irritating defensive liquid by a succession of very fast jets. This phenomenon begins in the pygidial glands, where two reagents mix, causing an explosion under high pressure and the release of this liquid. The internal and anatomical mechanisms enabling this prowess…
Nombre de vues : 5 124 Regions of the world, geographically isolated from other continents for millions of years, have allowed the appearance of unique, rare and incredible animal and plant species. New Zealand is probably one of the most interesting countries. Several emblematic species have lived and still live on this territory. For example, the…
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