Blackcaps breeding in the north of the range have an earlier and shorter post-juvenile moult than those further south, and cross breeding of captive birds shows that the timing is genetically controlled.
Cross breeding of captive birds shows that the timing is genetically controlled. Blackcaps breeding in the north of the range have an earlier and shorter post-juvenile moult than those further south.
Blackcaps breeding in the north of the range have an earlier and shorter post-juvenile moult than those further south. Cross breeding of captive birds shows that the timing is genetically controlled.
Blackcaps breeding in the north of the range have an earlier and shorter post-juvenile moult than those further south. Cross breeding of captive birds shows that the timing is genetically controlled.