Direct measurements of forage production 
and utilization reveal what is happening to the 
habitat generally, but they do not tell us what 
a given animal ate on a given day. Conversely, 
what one or several animals eat during a given 
period may tell us very little about the impact 
of grazing or browsing on the forage resource. 
Adequate information on range-animal rela- 
tionships requires full use both of direct mea- 
surements of vegetation, and of measurements 
that employ animals as collectors or as collec- 
tors and processors of forage. 
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