Softpedia >News >Stories about feather darkening (1 items)
Softpedia Homepage   

Stories about: feather darkening  

  • Nature
  • By Gabriel Gache
  • June 4th, 2008
A Little Bit of Color Turns Barn Swallows into Macho Males

A Little Bit of Color Turns Barn Swallows into Macho Males

Feather darkening boosts testosterone levels in barn swallows