may act as both and . They influence local environments and s, determi — Megafauna

"Hunting by humans played a major role in extirpating terrestrial megafauna on several continents and megafaunal loss continues today in both terrestrial and marine ecosystems. Recent declines of large marine vertebrates that are of little or no commercial value, such as s, s and s, have focused attention on the ecological impacts of , in global fisheries. In spite of the recognition of the problem of bycatch, few comprehensive assessments of its effects have been conducted. Many vulnerable species live in pelagic habitats, making surveys logistically complex and expensive. Bycatch data are sparse and our understanding of the demography of the affected populations is often rudimentary. These factors, combined with the large spatial scales that pelagic vertebrates and fishing fleets cover, make accurate and timely bycatch assessments difficult. Here, we review the current research that addresses these challenging questions in the face of uncertainty, analytical limitations and mounting conservation crises."

"Zoos worldwide are visited by great numbers of people, and many of these visitors prefer to see large, rare mammals, the so-called . Zoos and the researchers who use them also appear to prioritise these species, as evidenced by the number of scientific publications which investigate the welfare of charismatic rather than non-charismatic species. However, the charismatic animals also attract more welfare-related concern from groups and the media than the non-charismatics. To this extent the charismatics could be regarded as problematic animals in the zoo. ... However, there is also evidence that their popularity helps zoos achieve their conservation mission, both by increasing funding available for field conservation and by contributing towards education and awareness raising of conservation issues. Nevertheless, the non-charismatics are equally deserving of attention, and more work needs to be done on their welfare."

"We identified a total of 362 extant megafauna species. We found that 70% of megafauna species with sufficient information are decreasing and 59% are threatened with extinction. Surprisingly, direct harvesting of megafauna for human consumption of meat or body parts is the largest individual threat to each of the classes examined, and a threat for 98% (159/162) of threatened species with threat data available. Therefore, minimizing the direct killing of the worlds largest vertebrates is a priority conservation strategy that might save many of these iconic species and the functions and services they provide."