The animalon the cover of Ruby on Rails:Up and Running is an ibex (Capra
pyrenaica). Found in the mountains of Europe, centralAsia, and North Africa, the
ibex spends most of its time at an altitude of 7,500 to 11,500 feet. The ibex is known
for its impressively long horns, which can grow up to three feet on males. During
mating season, ibex males bang their horns together in intense battles over mating
Although the physics of such a feat seems dubious, according to legend, the ibex’s
horns were so strong that, if threatened, the animal could hurl itself from a precipice
and land unharmed on them.