Cooperatively breeding birds and fish may have evolved the adaptive ability to reduce the size of their eggs when helpers are available to lighten the parental load, a new study suggests. The findings indicate that in some species, the social environment may influence female reproductive decisions even prior to the birth of offspring.
Babies as young as 10 months can assess how much someone values a particular goal by observing how hard they are willing to work to achieve it, according to a new study from MIT and Harvard. This ability requires integrating information about both the costs of obtaining a goal and the benefit gained by the person seeking it, suggesting that babies acquire very early an intuition about how people make decisions.
Camponotini ant species have their own distinct microbiomes and the bacteria may also vary by developmental stage, according to a study published Nov. 22, 2017, in the open-access journal PLOS ONE by Manuela Oliveira Ramalho from the Universidade Estadual Paulista 'Júlio de Mesquita Filho,' Brazil, and colleagues.
A special publication titled "Planetary Biodiversity Inventory (2008-2017): Tapeworms from the Vertebrate Bowls of the Earth," just published by the University of Kansas Museum of Natural History.
When a woman chooses not to take her husband's surname after marriage, people perceive her husband as being higher in traits related to femininity and lower in traits related to masculinity. He is also perceived as having less power in the relationship. This is according to a study led by Rachael Robnett of the University of Nevada in the US. The research is published in Springer's journal Sex Roles.
The first comparison of plain water, electrolyte injections and a chicken-flavored electrolyte drink as techniques for keeping sniffer dogs hydrated when working in hot weather finds that while all are safe and effective, dogs drink more and are more hydrated when given a chicken-flavored electrolyte drink.
A mutation in a gene called SCL24A4 that causes enamel hypoplasia, or poorly formed enamel of the teeth in Samoyed dogs has been identified by researchers at the Center for Companion Animal Health, University of California, Davis. The findings are published in the open-access journal Canine Genetics and Epidemiology.
Rural coal-mining families show resilience against divorce when faced with the economic downturns common in the industry, a new study suggests. Researchers found that rural counties with higher levels of coal jobs had lower divorce rates compared with similar counties with fewer coal jobs during the 1990s, when the coal industry was losing jobs.
Oocyte cryopreservation is on the rise, and whether a woman freezes her eggs before undergoing medical treatment that could leave her infertile or undergoes an elective procedure to avoid concerns about reproductive aging, extensive counseling should be the norm.
Researchers in the University of Helsinki's Canine Mind research project found that oxytocin made dogs interested in smiling human faces. It also made them see angry faces as less threatening. Associated with affection and trust, the hormone oxytocin is probably a key factor in the interaction between dogs and humans.