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View Resource An ant (Crematogaster opuntiae) visits an extrafloral nectary of a fishhook barrel cactus (Ferocactus wislizeni).

An ant (Crematogaster opuntiae) visits an extrafloral nectary of a fishhook barrel cactus (Ferocactus wislizeni). In many mutualistic species interactions, a suite of species in one guild exchanges...

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View Resource A Red Knot foraging for bivalves in mud exhibits its ability to flex the tips of its upper mandible (rhynchokinesis).

Red Knots (Calidris canutus) feed on bivalves that live buried in mud. Using their smart bill tip, Red Knots are able to find such hard-shelled prey very efficiently. Red Knots are highly gregarious,...

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View Resource A mycorrhizal fungus, Cortinarius favrei, grows among associated plant species in the Alaskan tundra.

Cortinarius favrei grows in the midst of dwarf birch (Betula sp.), Salix sp., Vaccinium sp., and Eriophorum sp. in the Alaskan tundra. The fruiting body (mushroom) of C. favrei is visible in the...

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View Resource A misty rainforest canopy in central Amazonia.

The central Amazon Basin is home to some of the most biologically diverse forests in the world. These rain forests are being reduced and fragmented at a fast rate (as of 2004, about 24 million...

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View Resource Elk (Cervus elaphus) search for food through snow in winter in the Rocky Mountains.

Elk (Cervus elaphus) and other ungulates in the Rocky Mountains of North America must cope with food shortages and severe weather during winter. The strength of density-dependence in these ungulate...

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