What is a zoological institution?

A zoological institution is primarily defined as a facility that displays wildlife to the public, allowing visitors to observe and learn about various animal species. These institutions play a significant role in education and conservation by showcasing diverse animal exhibits and providing information about different species' natural habitats, behavior, and conservation status.

While other options, such as sanctuaries for endangered species or research centers for animal behavior, do contribute to the field of zoology, they represent specific functions or focuses rather than the overarching concept of a zoological institution. The correct answer captures the essence of what a zoological facility is – a place where the public can engage with and learn about a broad spectrum of wildlife, which can include education about their care and the threats they face in the wild.