Answer:
The great diversity of birds, quite different from ours, is truly marvelous.
Step-by-step explanation:
Objective statements are statements based only on facts. Subjective statements are the opposite; they are influenced by a person's feelings, opinions, beliefs, and assumptions.
All of the narrator's statements from the given passage are objective, except for the last one: The great diversity of birds, quite different from ours, is truly marvelous. Here, he expresses what he thinks about the fauna of Madagascar - he thinks that it's marvelous. That is not a fact, but an opinion. Someone else could disagree and say that they are not impressed. Opinions have nothing to do with the objective reality, which is why they can be completely different while referring to the same subject.