Ethologists study how animals use what in their natural environment
Energy Chlorophyll fur digestion instincts lungs an object Energy.
A B C D E F G H
Animals behave according to instinct.
Ethologists usually study how animals use instincts in their natural environment
Ethologists study how animals use what in their natural environment (A) Energy (B) Chlorophyll (C) fur (D) digestion (E) instincts (F) lungs (G) an object (H) Energy.