science top stories popular news  

Daily non-political popular news in brief.

Why are male antlers and horns so large?

03-16-2007 · EurekAlert!

Since Darwin, researchers have supposed that the large size of male ungulate antlers and horns is a signal that this is a male with sexual vigor, health, strength, hierarchical status or the ability to fight. Research in male roe deer showed that the size of the antlers did match age and body mass and resilience to environmental conditions.

Read more »

Keywords: male, antlers, horns, large, antler, horn

« Previous | Next »

Similar news on "Why are male antlers and horns so large?":

  1. Horns vs. Sperm: Male beetles on tight equipment budget
    10-21-2006 · Science News Online
    A group of dung beetle species that sprout elaborate horns often face trade-offs between horn and testes sizes.
    Similar news · Read more »
  2. Bigger horns equal better genes
    06-05-2007 · EurekAlert!
    According to a team of international researchers, mature, male alpine ibex demonstrate a correlation between horn growth and genetic diversity. The researchers believe their study offers evidence to support the mutation accumulation theory of ageing, which is the idea that, because natural selection weakens with age, genetic mutations have effects that accumulate over time.
    Similar news · Read more »
  3. Scientists crack rhino horn riddle
    11-06-2006 · EurekAlert!
    Rhinoceros horns have long been objects of mythological beliefs. Some cultures prize them for their supposed magical or medicinal qualities. Others have used them as dagger handles or good luck charms. But new research at Ohio University removes some of the mystique by explaining how the horn gets its distinctive curve and sharply pointed tip.
    Similar news · Read more »
  4. Penn Veterinary Medicine report new strategy to create genetically modified animals
    09-20-2007 · EurekAlert!
    Researchers at Penn Vet have demonstrated a new strategy for genetic modification of large animals by employing a virus that transfers genetic modifications to male reproductive cells, which passes naturally to offspring. Scientists at the Center for Animal Transgenesis and Germ Cell Research at Penn introduced adeno-associated virus to germline stem cells in goats and mice. AAV stably transduced male germ line stem cells and led to transgene transmission through the male germ line.
    Similar news · Read more »
  5. No evidence that widely prescribed statins protect against prostate cancer
    08-09-2007 · EurekAlert!
    A large community-based study refutes previous findings that statins -- a top-selling drug class, worldwide -- might cut one's risk of developing prostate cancer by reducing production of the male hormones that fuel cancer growth.
    Similar news · Read more »
  6. AIDS Avoidance: More studies find that circumcision deters HIV
    12-23-2006 · Science News Online
    Two large trials in Africa find that male circumcision limits HIV infection, which could prompt governments on that continent to promote or subsidize the operation.
    Similar news · Read more »
  7. Low-dose aspirin offers lower chance of asthma
    01-15-2007 · EurekAlert!
    In a large, randomized, placebo-controlled study of 22,071 healthy male physicians, taking a low-dose of aspirin every other day lowered the risk of receiving an initial asthma diagnosis by 22 percent.
    Similar news · Read more »
  8. Survey of Marine Corps military recruits reveals risk factors for alcohol disorders in young adults
    12-04-2006 · EurekAlert!
    Young men age 18 to 20 are significantly more likely to be risky drinkers if they start drinking alcohol at a young age, according to a large survey of male Marine Corps recruits, the results of which are published in the December issue of Archives of Pediatrics & Adolescent Medicine, one of the JAMA/Archives journals. Other risk factors for drinking problems include tobacco use, having a small or rural hometown and growing up in a household with alcohol abuse.
    Similar news · Read more »
  9. How does one sex grow larger than the other?
    01-29-2007 · EurekAlert!
    In most arthropod groups females are larger and therefore grow faster, a pattern markedly different from primates and birds, which showed differences in growth period. One explanation of why females can grow faster is that, although it is generally cheaper to produce (small) sperm than (large) eggs, it may be costlier to produce male gonads and genitalia.
    Similar news · Read more »
  10. Wood ant queen has no egg-laying monopoly
    06-27-2007 · EurekAlert!
    Insect queens were thought to have an egg-laying monopoly, but nine wood ant species revealed widespread reproductive activity by worker ants. Genetic analysis showed that as many as one in four eggs were laid by workers. Workers in many insect species can lay unfertilized male eggs, but usually workers in large colonies enforce the exclusive reproduction of the queen.
    Similar news · Read more »