burrows or in other ways in the daytime or at night; habits associated 

 with nest approach; regularity of use of bedding or nesting places; 

 associates, such as insects, in dens or nests; earth packing in 

 burrows; earth plugs, their structure and function; extent of den 

 expansion; temperature studies of burrows and nests under different 

 climatic and other environmental conditions at different depths and 

 at different times of day, season, and year; numbers, plan, elevation, 

 measurements of nests and nest chambers; technic for excavating and 

 mapping dens; for reproduction or making casts of tunnels; measuring 

 length and volume of tunnels. 



(3) Structure and behavior of mammals in nonbreeding condition--structure8 



and habits observable in fall and winter; temperament, adaptations 

 enabling mammal to endure stress of seasons; postbreeding migration, 

 dispersal of families, flocking, wandering, food getting* 



(4) Size of adults; ossification of bones; coat color; other features in 



structure, behavior, or relationship peculiar to mature adults. 



C, Old age. 



(1) Effect of old age on structure and behavior — general appearance of 



health, condition of teeth, coat, other external features; flocking 

 or herding habits; hez^its or recluses among mammals. 



(2) Food and shelter of the old. 



(3) Enemies, ccmpetitors, associates, means of cooperation and protection. 

 (4] length of life; time, place, and manner of death. 



Structure and Behavior 

 A. Structure. 



(1) FozTO of body — proportions, contour, weight, dimensions. 



(2) Special or noteworthy developments — head, trunk, tail, limbs, hands, 



feet, skin, hair, muscles, bones, glands, protective armor, sense 

 organs, other noteworthy features. 



(3) Periodic structural changes — change with age, particularly ossification 



of bones, wear of teeth, branching of antlers, or development or modi- 

 fication of other appendeiges; periodic sexual changes; changes with 

 season, molts, and growth, addition, increase, decrease, or loss of 

 special appendages or organs. 



(4) Adaptations — overdevelopment or underdevelopment of bodily parts; 



markings or coloration— concealing, disruptive, directive, warning, 

 mimicking; structures formerly beneficial, now harmful. 



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