- Ovenbirds, who carry clumps of mud up into the trees to make their nest
- Darwin's bark spiders, who build webs stretching out as far as three buses, end-to-end
- Moles, who use their spade-like paws to dig extensive networks of tunnels with nesting spaces and storerooms where they keep earthworms to snack on later
- Polar bear mothers, who make their dens under the snow to stay in for five long months, nursing their cubs and eating nothing themselves
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