% arara: pdflatex
\documentclass[a4paper]{article}

\usepackage[american,british]{babel}

\usepackage{animals2}

\begin{document}

\selectlanguage{british}

\catname.
\dogname.
\ladybirdname.

\selectlanguage{american}

\catname.
\dogname.
\ladybirdname.

\end{document}