Having or showing an eagerness to fight
Squirrels are restless, courageous and pugnacious little animals.
It is a clever, agile and powerful dog, extremely pugnacious in disposition.
It is exceedingly fierce and pugnacious, the males especially fighting with each other for possession of the females.
This suggests that the resemblance to the pugnacious drongo may be beneficial in protecting the defenceless cuckoo from enemies.
The Mexican Trimorphodon much resemble viperine snakes with the flat, triangular head, narrow neck, slit-like pupil and pugnacious disposition.