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Findings point to complex social behaviour
The large tusks of an animal that roamed Earth before the dinosaurs may provide the earliest evidence yet of male-female distinctions in land animals that existed millions of years ago, say U of T scientists.
Robert Reisz, a biology professor at the University of Toronto at Mississauga, and his team have found convincing evidence of sexual dimorphism – different physical traits between the sexes of the same species – in their study
Recent research shows that insects and humans have something surprising in common: Some six-legged species take in oxygen using a similar means to the way we fill our lungs.
Scientists from the Field Museum and Argonne National Laboratory in Chicago and from Clemson University used a powerful x-ray imaging device to get the first comprehensive view of live insects breathing. Their observations and research results are reported in the Jan. 24 issue of Science, an internationally respected res
Opens new door to study of mood disorders in humans
Researchers report finding a gene that is essential for normal levels of anxiety and aggression. Calling it the Pet-1 gene, researchers at the Case Western Reserve University School of Medicine Department of Neurosciences say that when this gene is removed or “knocked out” in a mouse, aggression and anxiety in adults are greatly elevated compared to a control (also called wild type) mouse.
(Videos displaying aggressive beha
The scientists have not yet found the limits of the monkeys’ learning capacity
Psychologists have found evidence that monkeys have sophisticated abilities to acquire and apply knowledge using some of the same strategies as do humans. Specifically, the researchers have discovered that rhesus monkeys can learn the correct order of arbitrary sets of images and can apply that knowledge to answer new questions about that order.
Not only can the monkeys choose which image came f
Researchers using three dimensional computer modeling and wind tunnels have made the first accurate comparative measurements of muscle power output of birds in-flight to establish that physical structure, body mass, force and flight style all have major effects upon the magnitude and shape of a species’ power curve.
The research by Harvard integrative physiologist Andrew A. Biewener and fellow researchers was publicly funded through the National Science Foundation (NSF) and published in the
Animals lacking molecules called cryptochromes have abnormal sleeping patterns because their internal biorhythms are disrupted. New research from scientists at Stanford University, the University of North Carolina and SRI International published in the open access journal, BMC Neuroscience shows that mice lacking these molecules also respond differently to sleep deprivation. This suggests that cryptochromes are also involved in sleep homeostasis, the process by which we feel tired after we have been