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Horizon

BBC TwoDocumentary · 62 seasons

7.5TMDB

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Season 4

Questions

Where can I watch Horizon?

Horizon streams on PBS.

How many episodes are in Season 4?

Season 4 has 23 episodes.

Episode roomHorizon S4 E21

Horizon · Season 4 · Episode 21

The Life and Death of the Pine Processionary

Tuesday, November 21 · 60 min

Horizon reports on the problem of exterminating the pine processionary caterpillars infestation from the pine forests of Provence, Canada.

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