An open canopy allows sunlight to filter down and reach normal-scale alders, maples, sword ferns and tiny, purple wild irises.

FORBES: Days of Wine and Redwoods

This immense canopy will open instantaneously and must absorb an impulse of almost 30 tonnes.

BBC: Mars Curiosity rover success depends on 'crazy' landing

The total acreage taken up by the pipelines, wind projects and related development isn't that large, but the open spaces they create allow predators and invasive species to permeate a canopy of trees that once kept them at bay.

WSJ: Northeast drilling boom threatens forest wildlife

The area was enclosed by a slanted canopy of partitioned glass, and I unlatched a panel and swung it open.

NEWYORKER: Midnight in Dostoevsky

Odzala is characterized by a rich variety of habitats, including primary rain forest with a closed canopy (e.g. with Entandrophragma utile, E. candollei and E. cylindricum) and open understorey layer, forests dominated by dense formations of Marantaceae, forest clearings and savannas on the hilltops (e.g. with Hymenocardia acida, Annona arenaria or Hyparrhenia diplandra).

UNESCO: Biosphere Reserve Information