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biologija

Še ena fotografija. Menda se je črv v školjki pojavil že večkrat. / Foto: Bralec

Se spomnite črva iz stranišča sredi Ljubljane? Kaj so ugotovili strokovnjaki

Overlook of Boiling Springs Lake from the trail with Lassen Peak in the distance. / Foto: Foto: National Park Service

SKRIVNOST PREŽIVETJA

Pri 63 °C se še vedno razmnožuje: odkrili so amebo, ki premika meje življenja

A Leopardus tilcayo cat, a newly identified species through research led by National Geographic Explorer Paola Nogales Ascarrunz, walks at the Senda Verde animal refuge in the Yungas region, Bolivia, September 1, 2026. Fernando Faciole/National Geographic/Handout via REUTERS THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY. NO RESALES. NO ARCHIVES. THIS IMAGE HAS BEEN SUPPLIED AND PROCESSED BY A THIRD PARTY AND IS DISTRIBUTED BY REUTERS AS RECEIVED.

Posvojili so mladiča, ko je zrasel, pa ugotovili, da gre za novo vrsto divje mačke

Thomas D. Seeley / Foto: Pupating

Ljudje v objektivu

Presenetljiva spoznanja o čebelji demokraciji

- 23.07.2026 - Matjaž Kuntner, biolog//FOTO: Jaka GasarOPOMBA: ZA OBJEKTIV - INTERVJU / Foto: Jaka Gasar

Matjaž Kuntner: Ne bomo se kar vrgli v prepad, če dvomimo, da obstaja gravitacija. Zakaj pa dvomimo o evoluciji?

Po Janezu Vajkardu Valvasorju drugi Slovenec s prestižnim mednarodnim priznanjem

Kraljeva družba

Po Janezu Vajkardu Valvasorju drugi Slovenec s prestižnim mednarodnim priznanjem

Bee going to sting woman on light blue background, closeup / Foto: Liudmila Chernetska

Matematiki narave

Čebele znajo šteti: nova raziskava razkriva presenetljivo numerično inteligenco domačih čebel

**VIDEO AVAILABLE: CONTACT INFO@COVERMG.COM TO RECEIVE**BY MARK WORGANOctopuses have a special 'sex arm' they use to identify partners by taste and mate with them, according to researchers at Harvard University.The findings, published in the journal Science, show that males can locate and fertilise females without seeing them, sometimes mating at arm's length.Scientists say the research sheds new light on how these largely solitary animals reproduce, and may help explain how new species evolve.Male octopuses have eight arms, but one - known as the hectocotylus - is specially adapted for reproduction."Male octopuses use a specialized arm called the hectocotylus to identify females and navigate their internal organs to reach the oviduct and deliver sperm," the researchers, led by lead author Pablo Villar, write in their paper.During mating, the arm searches for the female's mantle cavity and deposits packets of sperm, known as spermatophores. The researchers found that the arm is lined with receptors similar to those used by other arms to explore the seabed.Octopus limbs are highly sensitive, with each suction cup containing thousands of sensory cells. Much of the animal's nervous system is distributed throughout its arms, allowing them to act independently of the brain.To test how the animals use these abilities, scientists observed mating behaviour in the California two-spot octopus (Octopus bimaculoides).Males and females were placed on opposite sides of a tank, separated by a barrier with small openings. Despite being unable to see each other, males were able to extend their specialised arm through the divider, locate the female and begin mating.The study found that such interactions could take place even in complete darkness. When two males were paired, however, no mating attempts were observed, suggesting females emit a specific chemical signal.Further experiments pointed to the hormone progesterone as a key factor.Research

Ljubezen na dosegu roke: lovka hobotnice je jezik in spolni organ hkrati

Mother with newborn baby son lying in bed / Foto: Alemoraes244

Zakaj so avtoimunske bolezni pogostejše pri ženskah? Znanost odkriva skrivnost v materinem telesu