Can female adult obesity be stopped at birth?
...n body weight gain and food intake was observed in females that persisted through 120 days. In contrast, no statistically significant change in either the food intake or body weight gain pattern was observed in males. The newborn animals that received NPY demonstrated hyperinsulinemia at three days of age,......have one very large claw that they wave to attract females to their burrows and females visit several males before choosing a mate by staying with a male in his burrow. These small crabs a...An old, familiar love nest helps sexual success
... well established in neuroendocrine research, with females in two sets of cages. In one set, the males had mated with females before, but they had not previously encountered a female in the second set of cages. The researchers...Role reversal: male gets easy ride in insect courtship
...tile eggs for up to two weeks," he says. So why do females let the male stay onboard? What does the female get for continually expending precious energy to feed and carry around the male? While they can only speculate at this stage, the biologists suggest that by keeping one male for long periods, possibly ...First descriptions of Indiana bat maternity roosts in the southern US
...0 members under the loose bark of roost trees, the females each bear a single young. Declines in Indiana bat populations, first noted in the 1960s, were initially attributed to human disturbance of the hibernation caves. When populations continued to decline even after caves were gated to block access, resea...Mutant gene found to cause early ovarian failure in mice
...e consequences. As the gene-altered mice aged, the females were observed to have fewer and smaller litters, a...activated earlier and much more widely than in the females with normal FOXO3a genes. When a follicle is activated, it moves from the "resting pool" - a female'...Ancestry mix may be one key to obesity
... obesity-related phenotypes among African American females and European American Females could be partly due to genetic factors." The comparison of resting metabolic rate did not show a significant association, but the researchers believe that the sample size was too small to make this an accurate measure. ...Cooperation between unrelated male lizards adds a new wrinkle to evolutionary theory
...ge males are very aggressive and mate with lots of females by taking over the territories of other males--Sin... "sneakers" who don't defend territories but mimic females and sneak behind the backs of territorial males to cuckold them. And blue males are mate guarders, k...Researchers discover use of novel mechanism preserves Y chromosome genes
...some the chromosome that distinguishes males from females has uncovered a novel mechanism by which it maintains its genetic integrity. The study is published in the current issue of Nature. All other chromosomes occur in pairs and preserve genetic integrity by exchanging information with matching genes on ...Finished Y-chromosome sequence reveals a genomic 'crystal palace'
...inactivation, so they are present in two copies in females and in one copy in males. So, maybe we should rethink the roles of the second sex chromosomes in these often dramatic differences in disease susceptibility between males and females."...Birds do it. Bugs do it. But why don't we?
...e New World monkeys have full color vision because females have two X chromosomes that harbor both red and green color vision genes. But males only have one X chromosome, so New World males have only one copy of either the red or green gene, and that leaves them color-blind. After the red/green gene duplic...New biography details adventures of 'Fritz Muller, A Naturalist in Brazil'
...llowtail butterfly species in which both males and females mimic a toxic butterfly. In Brazil, West became familiar with a legendary figure, Fritz Mller, whose adventures as a pioneer farmer and naturalist in Brazil during the 19th century West details in his biography Fritz Mller, A Naturalist in Brazil. ......ecifics: In some birds, e. g. blue tits, males and females have different UV patterns in their plumage. UV vision is also important for bird foraging: the waxy cover of many berries has a high UV reflectance. UV vision is part of the sensory equipment of many vertebrates and invertebrates (e. g., honeybees),...Monogamous animals may be more likely to die out
...is some evidence that hunters take more males than females from populations, which could lead to a dearth of males available for pairing in monogamous species. In contrast, species with large harems are more likely to have plenty of "spare" males. Another possibility is that when animals live in pairs or sma...Early-life environments shape development of stress behaviors and learning abilities in mice
...rposes, they also transferred embryos to surrogate females within the same strain. At birth, all mice were c...embryos to and also later reared by surrogate BALB females demonstrated an increase in stress-reactive behaviors. These mice were less likely to explore new en...Male pregnancy in seahorses may affect formation of new species
...nique used in humans. Researchers tagged males and females in the field, sampled the DNA of the males progeny and then determined the mother of those offspring. Then, researchers compared the sizes of male and female partners to chart a statistical trend that indicated size-similar mating. A third line of ev...What goes wrong in older eggs?
...ficult to examine how this process deteriorates in females over a span of twenty years," said Bickel. "So we wanted to find out if we could utilize Drosophila as a model system to measure a similar phenomenon. Because flies are easy to grow in the lab, it's possible to look at thousands of flies and determin...Seal pups recognize mother's voices within days of birth
...e ashore to breed in dense colonies, the lactating females must leave their newborn pups on land while they forage for food at sea. As with most social species, the fur pups only feed their own offspring so when the mother returns from sea, it is essential for the mother and pup to find each other among the ...Butterflies use polarized light to attract mates
... light. Males of an iridescent species approached females producing polarized signals significantly more often when signals were not depolarized. Males of another, non-iridescent species approached females, which do not produce polarized signals, at the same rate regardless of the presence or absence of th...Highway deaths highest for males Male urban squirrels, that is
...us recently showed that males are more likely than females to die on the road, and scientists believe it's be... animals. "First year survival was 80 percent for females and 74 percent for males," Lopez said. "And interestingly, we found that highway mortality accounted...