Some formal call for mitigation of the perceived damage incurred to sites is an increasingly frequent demand on developers of sites of conservation significance. The broad theme of ‘bio-offsets’ is receiving increasing attention in many parts of the world. Wide discussion of the values of ‘Environmental Offsets’ under the federal Environment Protection and Biodiversity Conservation Act 1999 (EPBC) in Australia encompasses measures considered to counterbalance the impacts to biodiversity that result from development. They range from rather nebulous ‘carbon offsets’ to counter industrial emissions to more limited measures of considerable interest in conservation and management of habitats for threatened insect species. These predominantly involve consequences of clearing native vegetation, long acknowledged as a paramount threat to Australia’s terrestrial biota. These measures may be purely voluntary, but are more commonly conditions of project approval, negotiated on a case-by-case basis, or more tangentially can be managed by some form of ‘credit’ purchased by developers in the form of a ‘conservation bank’. Essentially, they fall into the category of direct offsets, to compensate for losses by providing a replacement habitat, or for enhancement of the remaining areas to increase carrying capacity—basically to at least result in ‘no net loss’ and no increased vulnerability to key species. However, there may be formal demand for a ‘net gain’, so that conservation benefits exceed the losses incurred from the development, or to ‘maintain or improve’ allowing flexibility for either standard to be met. At one level, the principle resembles a ‘salvage operation’, in which a duty of care (moral or legal) may (1) incur capture of individuals likely to otherwise be sacrificed, either for direct translocation or to some ex situ situation for later release; or (2) provide opportunity for natural dispersal to the offset habitat. The Australian government’s definition of ‘environmental offsets’ is ‘actions taken outside a development site that compensate for the impacts of that development— including direct, indirect or consequential impacts’ (Australian Government 2007). The policy background is discussed by Gibbons and Lindenmayer (2007), who emphasized that offsets should not be used to justify land clearing, and that offsets might be feasible (1) only for relatively simple vegetation types that can indeed be restored; (2) where the offset must be in place before loss of the original site occurs; (3) where management of the offset site is adaptive; and (4) that the offset sites must be secured for the future. Compliance issues may be difficult to ensure. The first condition is important: Morris et al. (2006) pointed out that many habitats may take decades or even a century or more to develop the full compensatory values of lost vegetation systems. However, even defining or categorizing those values may be difficult. In practice, habitat-based offsetting for individual insect species or populations tends to be viewed as a short-term operation, and so poses both ethical and practical problems, the balance of these varying between individual cases, and reflecting the ease of defining and providing sites and/or resources, the need for long-term commitment (countering the expectations of some developers viewing it as a ‘quick fix’ to expedite their development plans), and lack of knowledge of the species involved, particularly their ecology, population structure and landscape geometry needs. Attractions to developers can include (1) a costeffective means to comply with environmental and planning laws; (2) faster processing times for approval; (3) T. R. New (&) Department of Zoology, La Trobe University, Victoria 3086, Australia e-mail: T.New@latrobe.edu.au