IPA: /ˌɛθəˈlɒdʒɪkəl/
KK: /ɛθəˈlɒdʒɪkəl/
Relating to the study of animal behavior in natural conditions.
The researchers conducted an ethological study to observe the mating rituals of birds in the wild.
Ethological → It is formed from "ethos" (from Greek ἦθος, meaning character or custom) and "-logical" (from Greek "logia", meaning study or science). The word refers to the study of animal behavior in relation to their environment and customs.
Think of 'ethos' as relating to character or custom, and '-logical' as the study of something. This helps you remember that 'ethological' is about the study of behavior related to character.