For the source text click/tap here: Beitzah 27
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This mishnah deals with what may be done with a beast (a cow, sheep, goat or bull) that has died on Yom Tov.
If a beast died [on Yom Tov] it may not be moved from its place.
Since the beast died and was not slaughtered, it cannot be eaten. Since it cannot be eaten there is nothing that one may do with it on Yom Tov. Hence, it is muktzeh. All that he can do is leave it in its place and then when Yom Tov is over he can cut it up, use its hide and feed dogs with its meat.
We discuss animal death and the science of global animal death and its relationship to wild animal welfare. We end with the curious play by Peter Schaffer "Equus" and a boy's mutilation of a horse analysed by his psychiatrist.