sentences:  Various surveys have shown however that the acquisition of wild caught animals (in particular mammals, birds and reptiles) by zoos has decreased significantly in the last years and that zoos increasingly manage to maintain their collections without introduction of animals caught in the wild.Indeed, many species are bred in zoos using sophisticated, and expensive, scientific procedures.The situation is somewhat different for aquaria, where – although an increasing number of fish and invertebrates can be bred in human care – still newly acquired animals are predominantly wild-caught.