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From Today's New York Times

Animal Ethics

To the Editor: Re “ Worry Under the Big Top as Mexico City Moves to Ban Circus Animals ” (news article, June 15): Mexico City joins the growing list of cities that have banned the exploitation of animals in circuses. Why is the United States lagging so far behind?

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How much bird is there, anyway?

10,000 Birds

He had the habit of asking very similar question about the animals featured in his zoology lectures, including basic questions like how big they are, what limits physiology puts on their geographic range, etc. For instance, among animals, booby and noddy combined probably represents the majority of the biomass of the somewhat unusual St.

Mammals 173