TY  - GEN
AU  - Collias, Elise C
AU  - Collias, Nicholas E
TI  - External contribution to animals
T2  - Benchmark papers in animal behavior
SN  - 047016543x
U1  - 591.56 COL 
CY  - Pennsylvania, Dowden Hutchinson & Ross Inc
KW  - Evolution - External construction - animals / Habit control - Behavioral energetics
ER  -