Levaillant's woodpecker Levaillant's woodpecker The Levaillant’s woodpecker or Levaillant’s green woodpecker ("Picus vaillantii") is a large African member of the woodpecker family Picidae. Levaillant's woodpecker is sometimes considered a subspecies of the European green woodpecker. It is monotypic, meaning it has no subspecies. This species was named in honour of the French explorer, collector and ornithologist, François Le Vaillant. Levaillant’s woodpecker is found in the three Maghreb countries Morocco, Algeria and Tunisia in northwest Africa. It breeds in mountain forests up to the treeline at around 2000m. Levaillant’s woodpecker is 30–33 cm in length with a 45–51 cm wingspan. It is very
An Essay on the Nature and Significance of Economic Science on economic methodology in generating a range of tightly-argued, radical implications from a simple definition, for example in admitting an "aspect" of behaviour (rather than a list of behaviours) but not limiting the subject-matter of economics, provided that the influence of scarcity impinges on these (pp. 16–17). The broad behavioural definition is credited for its consistency with the expanding boundaries of economics decades later. In this Robbins both narrows the definition of economics, thereby demonstrating the usefulness of deduction, and opens up the subject-matter of economics. Robbins's "Essay" is one of the most-cited works on the methodology and philosophy of