Zoo's effort to mate endangered tigers ends with one killing the other

World London Zoo's effort to mate 2 endangered tigers ends with one killing the other "Their introduction began as predicted, but quickly escalated into a more aggressive interaction," the London Zoo said.

Sumatran tigers walks next to the board in their enclosure during the annual stocktake at ZSL London Zoo on Jan. 3, 2019 in London.Wiktor Szymanowicz / Barcroft Media via Getty Images file Breaking News Emails Get breaking news alerts and special reports.

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