Use legislative regulation to protect wild populations - Six out
of seven before-and-after studies and two literature
reviews/meta-analyses found evidence that legislation protects
bird populations. - Five studies in Europe, Indonesia and across
the world found increased population levels of vultures,
raptors, cranes and cockatoos following protective legislation
(amongst other interventions). However, one found populations of
raptors declined soon after. The literature review also found
two cases of limited or no impact of legislation. - Two before-
and-after studies from Denmark and the USA and Canada and the
meta-analysis found increased estimated survival of falcons,
ducks and parrots with stricter protection, but not necessarily
population-level responses. - A meta-analysis found decreased
harvest of parrots in areas with stricter protection regimes,
but a before-and-after study found no evidence for reduced
shearwater harvest with legislation. Perhaps the most commonly
used intervention in response to de