\TrackLangProvidesResource{en-GB}[2016/10/06 v1.2]

\providecommand*{\enGBanimals}{%
  \englishanimals
  \renewcommand*{\ladybirdname}{ladybird}%
}

\TrackLangRequireResourceOrDo{english}%
{
  \TrackLangAddToCaptions{%
    \renewcommand*{\ladybirdname}{ladybird}%
  }
}
{
  \TrackLangAddToCaptions\enGBanimals
}