\newcommand{\F}[1]{
  \includegraphics[width=\hsize]{#1}
}
\newcolumntype{H}[1]{>{\hsize=#1\hsize}X}
\ctable[
  caption = a figure,
  figure, botcap,
  width=.4\hsize,
]{H{.4}H{.6}}{}{\FL
  \F{penguin}& \F{lion}\LL
}