\ProvidesAnimalsLang{en-GB}

\RequireAnimalsLang{english}%

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

\englishGBanimals

\@ifundefined{captions\CurrentTrackedDialect}
{%
  \@ifundefined{captions\CurrentTrackedLanguage}{}%
  {%
    \expandafter\g@addto@macro
      \csname captions\CurrentTrackedLanguage\endcsname{\englishGBanimals}%
  }
}%
{%
  \expandafter\g@addto@macro
    \csname captions\CurrentTrackedDialect\endcsname{\englishGBanimals}%
}