Illegal wildlife trade (IWT) has increased in profile in recent years as a global policy issue, largely because of its association with declines in prominent internationally trafficked species. In this review, we explore the scale of IWT, associated threats to biodiversity, and appropriate responses to these threats. We discuss the historical development of IWT research and highlight the uncertainties that plague the evidence base, emphasizing the need for more systematic approaches to addressing evidence gaps in a way that minimizes the risk of unethical or counterproductive outcomes for wildlife and people. We highlight the need for evaluating interventions in order to learn, and the importance of sharing datasets and lessons learned. A more collaborative approach to linking IWT research, practice, and policy would better align public policy discourse and action with research evidence. This in turn would enable more effective policy making that contributes to reducing the threat to biodiversity that IWT represents.

Highlights Calls to ban wildlife trade have been a key response to COVID-19 but are not the solution. The major drivers of the emergence of infectious diseases include habitat destruction and industrialised livestock production. Indiscriminate wildlife trade bans risk doing more harm than good, both from a conservation and development perspective. Conservation-linked responses to COVID-19 need to address the key drivers, respect rights and ensure local participation in decision-making.

Illegal wildlife trade is gaining prominence as a threat to biodiversity, but addressing it remains challenging. To help inform proactive policy responses in the face of uncertainty, in 2018 we conducted a horizon scan of significant emerging issues. We built upon existing iterative horizon scanning methods, using an open and global participatory approach to evaluate and rank issues from a diverse range of sources. Prioritized issues related to three themes: developments in biological, information, and financial technologies; changing trends in demand and information; and socioeconomic, geopolitical shifts and influences. The issues covered areas ranging from changing demographic and economic factors to innovations in technology and communications that affect illegal wildlife trade markets globally; the top three issues related to China, illustrating its vital role in tackling emerging threats. This analysis can support national governments, international bodies, researchers, and nongovernmental organizations as they develop strategies for addressing the illegal wildlife trade.

Overexploitation is a key driver of biodiversity loss but the relationship between the use and trade of species and conservation outcomes is not always straightforward. Accurately characterizing wildlife trade and understanding the impact it has on wildlife populations are therefore critical to evaluating the potential threat trade poses to species and informing local to international policy responses. However, a review of recent research that uses wildlife and trade-related databases to investigate these topics highlights three relatively widespread issues: (1) mischaracterization of the threat that trade poses to certain species or groups, (2) misinterpretation of wildlife trade data (and illegal trade data in particular), resulting in the mischaracterization of trade, and (3) misrepresentation of international policy processes and instruments. This is concerning because these studies may unwittingly misinform policymaking to the detriment of conservation, for example by undermining positive outcomes for species and people along wildlife supply chains. Moreover, these issues demonstrate flaws in the peer-review process. As wildlife trade articles published in peer-reviewed journals can be highly influential, we propose ways for authors, journal editors, database managers, and policymakers to identify, understand, and avoid these issues as we all work towards more sustainable futures.

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Legal hunting of threatened species-and especially the recreational practice of "trophy hunting"-is controversial with ethical objections being increasingly voiced. Less public attention has been paid to how hunting (even of threatened species) can be useful as a conservation tool, and likely outcomes if this was stopped. As case studies, we examine the regulated legal hunting of two African rhino species in South Africa and Namibia over the last half-century. Counterintuitively, removing a small number of specific males can enhance population demography and genetic diversity, encourage range expansion, and generate meaningful socioeconomic benefits to help fund effective conservation (facilitated by appropriate local institutional arrangements). Legal hunting of African rhinos has been sustainable, with very small proportions of populations hunted each year, and greater numbers of both species today in these countries than when controlled recreational hunting began. Terminating this management option and significant funding source could have negative consequences at a time when rhinos are being increasingly viewed as liabilities and revenue generation for wildlife areas is being significantly impacted by COVID-19. Provided that there is appropriate governance, conservation of certain highly threatened species can be supported by cautiously selective and limited legal hunting.

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