Luristan bronze by most families. Taking the groups in what is now generally considered to be their broad chronological sequence, the first are the "animal finials", with two rampant confronted animals, generally a pair of large-horned ibex (or goats or mouflon sheep) or felines, facing each other with a central tube or open rings (formed at the junctions of their front and hind feet) between them. The bezoar ibex ("capra aegagrus aegagrusis"), the local wild species of goat or ibex, was already domesticated millennia before; it has large curved horns with knobbly ribs. Compared to later types, the animals are more naturalistic,
Species homogeneity calories. 95% of world consumption of protein derives from a few domesticated species, i.e. poultry, cattle and pigs. There are about 1,000 commercial fish species, but in aquaculture fewer than 10 species dominate global production. Human food production therefore rests on the tips of pyramids of biodiversity, leaving the majority of species not utilised and not domesticated. Species naturally migrate and expand their ranges, utilising new habitats and resources, e.g. the cattle egret. These natural invasions, an incursion in the absence of anthropogenic influences, occur "when an intervening barrier is removed, or through the development of biotic or abiotic transportation