Evolution
Study finds some tropical Heliconius butterflies can live nearly a year and show slower physical decline
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A University of Bristol-led study reports that some Heliconius butterflies are among the longest-lived butterflies documented, with one individual recorded living 348 days, and that at least one species shows little measurable loss of muscle performance with age.
New research indicates that the earliest primates originated in cold and dry regions of North America rather than tropical forests. The findings challenge long-held assumptions about primate evolution.
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Newly examined fossils indicate that the earliest four-limbed vertebrates developed directly into adults without a larval phase featuring external gills.
Tiny wrens on remote Scottish islands are growing much larger than their mainland relatives and developing distinct traits that may lead to new species.
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Scientists have used genetic analysis of historic specimens to determine that the crocodiles once found in the Seychelles were not a unique species but an isolated population of saltwater crocodiles. The reptiles likely reached the remote islands after drifting across the Indian Ocean. The population was wiped out within decades of permanent human settlement in 1770.
Researchers have described a previously unknown sauropod dinosaur from fossils found in Argentina's Chubut province. The creature, called Bicharracosaurus dionidei, reached about 20 meters in length and lived around 155 million years ago.
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Scientists have determined that structures once seen as traces of tiny animals in 540-million-year-old Brazilian rocks are actually fossilized communities of bacteria and algae. The reexamination uses advanced imaging to reveal preserved cells and organic material.
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