Why are pygmy rattlesnakes often reluctant to use their venom defensively?

Answer

Venom production is metabolically costly.

Like most venomous snakes, the pygmy rattlesnake is often reluctant to use its venom unless directly handled or stepped upon because venom production requires significant metabolic resources.

Why are pygmy rattlesnakes often reluctant to use their venom defensively?
reptileviperRattlesnake