Why Do Animals, Especially Males, Have So Many Different Colors?

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This male Hetaerina damselfly from the occisa species has red spots at the base and tip of its wings but no black pigmentation.

Why do so many animal species — including fish, birds and insects — display such rich diversity in coloration and other traits? In new research, Gregory Grether, UCLA professor of ecology and evolutionary biology, and Christopher Anderson, who recently earned his doctorate in Grether’s laboratory, offer an answer.

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Hormone That Affects Finger Length Key To Social Behavior

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White-faced Capuchin (Cebus capucinus) checking its nails

Research at the universities of Liverpool and Oxford into the finger length of primate species has revealed that cooperative behavior is linked to exposure to hormone levels in the womb.

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Junk DNA Mechanism That Prevents Two Species From Reproducing Discovered

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When two populations of a species become geographically isolated from each other, their genes diverge from one another over time.

Cornell researchers have discovered a genetic mechanism in fruit flies that prevents two closely related species from reproducing, a finding that offers clues to how species evolve.

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Female Choice Benefits Mothers More Than Offspring

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The great diversity of male sexual traits, ranging from peacock’s elaborate train to formidable genitalia of male seed beetles, is the result of female choice.

The great diversity of male sexual traits, ranging from peacock’s elaborate train to formidable genitalia of male seed beetles, is the result of female choice. But why do females choose among males? In a new study published October 22 in Current Biology, researchers from Uppsala University found no support for the theory that the female choice is connected to “good genes”.

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Absent Pheromones Turn Male Flies Into Lusty Lotharios

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Fruit flies.

When Professor Joel Levine’s team genetically tweaked fruit flies so that they didn’t produce certain pheromones, they triggered a sexual tsunami in their University of Toronto Mississauga laboratory. In fact, they produced bugs so irresistible that normal male fruit flies attempted to mate with pheromone-free males and even females from a different species-generally a no-no in the fruit fly dating scene.

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Loyal Alligators Display Mating Habits Of Birds

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New studies show that alligators display the same loyalty to their mating partners as birds.

Alligators display the same loyalty to their mating partners as birds reveals a study published today in Molecular Ecology. The ten-year-study by scientists from the Savannah River Ecology Laboratory reveals that up to 70% of females chose to remain with their partner, often for many years.

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Mother Knows Best: Females Control Sperm Storage To Pick The Best Father

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Field cricket.

Scientists have found new evidence to explain how female insects can influence the father of their offspring, even after mating with up to ten males. A team from the University of Exeter has found that female crickets are able to control the amount of sperm that they store from each mate to select the best father for their young. Continue reading… “Mother Knows Best: Females Control Sperm Storage To Pick The Best Father”

Zebrafish Cloning Methods Improved

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These are zebrafish that were cloned in the Michigan State University Cellular Reprogramming Laboratory

A team of Michigan State University researchers has developed a new, more efficient way of cloning zebra fish, a breakthrough that could have implications for human health research.

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Inbred Bumblebees Less Successful Due To ‘Inefficient’ Males

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Two bumblebees. Declining bumblebee populations are at greater risk of inbreeding, which can trigger a downward spiral of further decline.

Declining bumblebee populations are at greater risk of inbreeding, which can trigger a downward spiral of further decline. Researchers have provided the first proof that inbreeding reduces colony fitness under natural conditions by increasing the production of reproductively inefficient ‘diploid’ males.

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Parasitic Worms Make Sex Worthwhile

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Potamopyrgus antipodarum is a snail that lives in the muds of New Zealand’s lakes, rivers and estuaries

The coevolutionary struggle between a New Zealand snail and its worm parasite makes sex advantageous for the snail, whose females favor asexual reproduction in the absence of parasites, say Indiana University Bloomington and Swiss Federal Institute of Technology biologists in this week’s Current Biology

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Battle Of The Sexes Benefits Offspring, Says Research In Birds

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as zebra finches fine-tune their songs, the brain initially stores improvements in one brain pathway before transferring this learned information to the motor pathway for long-term storage

Learning complex skills like playing an instrument requires a sequence of movements that can take years to master. Last year, MIT neuroscientists reported that by studying the chirps of tiny songbirds, they were able to identify how two distinct brain circuits contribute to this type of trial-and-error learning in different stages of life.

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