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But when it blooms, the cactus lures pollinators, such as this Darwin's finch and carpenter bee (above), to feed on nectar from its flowers.
For over two decades Peter and Rosemary Grant have examined the ecology and evolution of Darwin's finch species inhabiting the Galapagos islands (Grant et al.
It is therefore not surprising that Darwin's finch species, although differing from each other in body mass, bill size and shape, and song, show no indication of genetic incompatibility after a period of less than 3 million yr since divergence from a common ancestor (P.
In one species of Darwin's finch (Geospiza fortis) smaller body size is favored in the first several months of life apparently because of the reduction in daily energy demands (Price and Grant 1984).