For 10 points, name these tanagers of the Galápagos that were first discussed in their namesake's The Voyage of the Beagle.
Variation in the size of a noted feature of these organisms is dependent on the expression of Bmp4 (B-M-P-4) and cal•modulin; that feature is either pink or yellow for the first two months of life. The A and B populations of these animals were studied on Genovesa, where both populations feed on the Opuntia (oh-POON-cha) prickly pear. In 1947, David Lack revised a monogram on these animals to theorize that their differences are not isolating mechanisms, but instead represent (*) adaptations to specific niches; that work was continued on Daphne Major by Peter and Rosemary Grant, who studied differences in beaks among these birds. John Gould distinguished thirteen species and four genera of these birds, which include the "ground" and "cactus" kinds. For 10 points, name these tanagers of the Galápagos that were first discussed in their namesake's The Voyage of the Beagle.
Variation in the size of a noted feature of these organisms is dependent on the expression of Bmp4 (B-M-P-4) and cal•modulin; that feature is either pink or yellow for the first two months of life.
Darwin's finches [or Geo•spizinae or Geo•spizini; accept Galápagos finches before “Galápagos”; prompt on “finches”] &lt;Hart&gt;