A study reported in the journal acta ethologica has recorded the use of ultrasound by amphibians for the first time in South America. It also describes the first documented case of the use of ultrasound for defense against predators‚ in a distress call of ear-piercing intensity to many animals‚ but inaudible to humans.

Frogs display a remarkable diversity of species as a whole‚ but does the same hold true for their visual abilities? A new study led by York University';s Faculty of Science has sought to answer this question by collaborating with researchers in Australia‚ Belgium‚ Brazil‚ Cameroon‚ Ecuador‚ Equatorial Guinea‚ French Guiana‚ Gabon‚ Seychelles‚ Sweden‚ United Kingdom and the United States‚ to get a sample of a diverse array of frogs to study the visual pigments found in their eyes.

Cold Spring Harbor Laboratory (CSHL) chemists have created a new collection of molecular compounds and begun testing them as potential leads in the search for new drugs. Among these molecules‚ they found several that show promise for development as antibiotics and cancer therapies. Sounds like a eureka moment? Well‚ sort of. But it';s more a case of hard chemistry made simple.

A team of researchers has uncovered alarming trends in the first range-wide genetic study of an endangered bee species. The study‚ led by Colorado State University and published in the Journal of Insect Science‚ will inform conservation and recovery efforts for the rusty-patched bumblebeea species that was once common in the United States but has declined from about 90% of its historic range.

Guessing your age might be a popular carnival game‚ but for astronomers it';s a real challenge to determine the ages of stars. Once a star like our sun has settled into steady nuclear fusion‚ or the mature phase of its life‚ it changes little for billions of years. One exception to that rule is the star';s rotation periodhow quickly it spins. By measuring the rotation periods of hundreds of thousands of stars‚ NASA';s Nancy Grace Roman Space Telescope promises to bring new understandings of stellar populations in our Milky Way galaxy after it launches by May 2027.

Despite their ancient ages‚ some stars orbiting the Milky Way';s central supermassive black hole appear deceptively youthful. But unlike humans‚ who might appear rejuvenated from a fresh round of collagen injections‚ these stars look young for a much darker reason.

A massive new global study led by the University of Copenhagen and University of Hohenheim has examined the effects of diversified agriculture. The conclusion is abundantly clearpositive effects increase with every measure‚ while negative effects are hard to find.

Alaskan waters are a critical fishery for salmon. Complex marine food webs underlie and sustain this fishery‚ and scientists want to know how climate change is reshaping them. But finding samples from the past isn';t easy.

In Earth science‚ small details can help explain massive events. Rita Parai‚ an assistant professor of Earth‚ environmental and planetary sciences in Arts &;amp; Sciences at Washington University in St. Louis‚ uses precision equipment to measure trace levels of noble gases in rocks‚ samples that can provide key insights into planetary evolution.

University of Otago researchers have formally identified and named a fossil dolphin which they discovered has a unique feeding method.