Which of the following animals is not permitted to be taken at any time?

Marten are classified as a protected species in California, which means they cannot be taken, hunted, or trapped at any time. This protection is part of the state's efforts to conserve wildlife populations and their habitats. Martens are not common and play an important role in their ecosystem, making it crucial to maintain their populations.

In contrast, badgers, gray foxes, and wild pigs can be taken under certain regulations and specified seasons, thus allowing for population control and management as deemed necessary by the California Department of Fish and Wildlife. Understanding the legal protections afforded to different wildlife species is essential for responsible trapping and wildlife management practices.