premise: A bird is perched on a tree branch. hypothesis: A bird is perching in a tree.
entailment: A tree branch is obviously part of a tree, so a bird perched on one is perching in a tree.|entailment: A bird is perched on a tree branch means perching in a tree.|entailment: If the bird is perched on a tree branch, they are on a tree. Perching is a rephrasing of perched.