 \lizard \urchin \lizard \coyote\deer \eel\otter \flamingo\octopus \frac{\epsilon _{A}^{\pm }(\theta )}{d\theta }+\frac{1}{2\pi }%\sum_{B}\int\limits_{-\infty }^{\infty }d\theta ^{\prime }\frac{\varphi_{AB}(\pm \theta \mp \theta ^{\prime })}{1+e^{\epsilon _{B}^{\pm }(\theta^{\prime })}}\frac{d\epsilon _{B}^{\pm }(\theta ^{\prime })}{d\theta^{\prime }}\,\approx \frac{r}{2}M_{A}\exp \theta \quad .  \label{der}