Urine scent marks are the original social media, allowing animals to advertise their location, status and identity. Now Cornell research is shining a new light—via thermal imaging of mice—on how this behavior changes ...
Plants & Animals
Mar 21, 2023
0
63
Researchers of the Department of Ethology, Eötvös Loránd University (ELTE) have been investigating dogs' reactions to wolf howls. Are there dogs that are more prone to reply with howling? Are these dogs genetically closer ...
Ecology
Feb 6, 2023
3
1671
White-necked jacobin hummingbirds sport a colorful blue-and-white plumage as juveniles. When they grow into adulthood, males retain this dazzling pattern, while females develop a more "muted" palette of green and white—at ...
Plants & Animals
Sep 7, 2022
1
194
Male bottlenose dolphins form the largest known multi-level alliance network outside humans, an international team led by researchers at the University of Bristol have shown. These cooperative relationships between groups ...
Plants & Animals
Aug 29, 2022
0
181
A team of researchers affiliated with several institutions in Argentina has found chromosomal evidence of people living in South America as far back as 18,000 years ago. The group has published a paper describing their work ...
Female white-faced capuchin monkeys living in the tropical dry forests of northwestern Costa Rica may have figured out the secret to a longer life—having fellow females as friends.
Plants & Animals
Aug 10, 2022
0
296
Ancient genomes from the herpes virus that commonly causes lip sores—and currently infects some 3.7 billion people globally—have been uncovered and sequenced for the first time by an international team of scientists led ...
Molecular & Computational biology
Jul 27, 2022
1
383
Entomophthora muscae is a widespread, pathogenic fungus that survives by infecting common houseflies with deadly spores. Now, research shows that the fungus has a unique tactic to ensure its survival. The fungus "bewitches" ...
Plants & Animals
Jul 15, 2022
2
4268
Some male wolf spiders seem to get luckier than others when it comes to courting females. The secret of their courtship? It's complicated, says a new study led by the University of Nebraska–Lincoln.
Plants & Animals
May 27, 2022
0
124
Researchers from McGill University have identified a form of chemical signaling in mice to defend their offspring. The researchers found that proximity to pregnant and lactating female mice increased stress hormones in males ...
Plants & Animals
May 24, 2022
2
160
Male (♂) refers to the sex of an organism, or part of an organism, which produces small mobile gametes, called spermatozoa. Each spermatozoon can fuse with a larger female gamete or ovum, in the process of fertilization. A male cannot reproduce sexually without access to at least one ovum from a female, but some organisms can reproduce both sexually and asexually.
Not all species share a common sex-determination system. In humans and most animals, sex is determined genetically but in other species it can be determined due to social, environmental, or other factors. The existence of two sexes seems to have been selected independently across different evolutionary lineages (see Convergent Evolution). Accordingly, sex is defined operationally across species by the type of gametes produced (ie: spermatozoa vs. ova) and differences between males and females in one lineage are not always predictive of differences in another.
Male/Female dimorphism between organisms or reproductive organs of different sexes is not limited to animals; male gametes are produced by chytrids, diatoms and land plants, among others. In land plants, female and male designate not only the female and male gamete-producing organisms and structures but also the structures of the sporophytes that give rise to male and female plants.
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