Because both types of crows live on islands, Rutz thinks the unique ecological conditions of tropical islands are the key. (newscientist.com)
Single motherhood, rather than reflecting an avoidant strategy in which close relationships are devalued, is often the result of ecological conditions in which paternal investment is desired but unavailable. (cambridge.org)
Mammals are one of the most morphologically diverse organisms, with adaptation to unique ecological conditions creating a wide array of forms, from mice to whales. (science.sciencemag.org)