Both zoom and prime lenses are used; zoom lenses (generally in the 70–200, 75–300, 100–400 or 200-400 range) allow a greater range of framing; primes are faster, cheaper, lighter, and optically superior, but are more restricted in framing.
Zoom lenses (typically in the 70–200, 75–300, 100–400 or 200-400 range) offer a broader range of framing options; primes are quicker, less expensive, lighter, and optically superior but have fewer framing possibilities.