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9 nests that aren't for the birds

By: Sidney Stevens on Aug. 8, 2015, 4:04 p.m.
The Morris Arboretum's tree nest is part of the Tree Adventure exhibit

Photo: Morris Arboretum

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Tree Adventure bird's nest

Housed at the Morris Arboretum at the University of Pennsylvania, this fanciful treetop roost is part of the Tree Adventure exhibit. Visitors take the 50-foot-high "Out on a Limb" tree canopy walk built by Metcalfe Architecture & Design to the immense bird’s nest at the end. Inside, kids are invited to sit on the oversized blue robin's eggs for the full nest experience.