What is the term for a young raptor that remains in the nest?

The term for a young raptor that remains in the nest is "eyass." An eyass refers specifically to a young bird of prey that is still dependent on its parents and has not yet left the nest, typically during the early stages of its life after hatching. This stage is crucial for the bird's development, as it relies heavily on parental care for food and protection.

In contrast, a fledgling is a bird that has developed enough to leave the nest but is still learning to fly and become independent. A nestling, on the other hand, generally refers to any young bird still in the nest but doesn’t specify that it is a raptor. Lastly, a hatchling is the very earliest stage of a bird's life, right after it has just emerged from the egg, but it does not convey the aspect of remaining in the nest as specifically as eyass does. This distinction underscores the importance of precise terminology in ornithology, particularly in the context of falconry and raptor conservation.