These authors' works have the subjects "mammals," "hoofed mammals," and "food chains (ecology)."

These authors' works have the subjects "mammals," "hoofed mammals," and "animal behavior."

These authors' works have the subjects "paleontology," "prehistoric animals," and "dinosaurs."

These authors' works have the subjects "paleontology," "prehistoric animals," and "mammals."

These authors' works have the genre "animal books"; and the subjects "birds," "marine animals," and "wildlife rescue."

These authors' works have the genre "animal books"; the subjects "birds," "animal behavior," and "zoology"; and illustrations that are "photographic illustrations."

These authors' works have the subjects "mammals," "hoofed mammals," and "birds."

These authors' works have the subjects "birds," "climate change," and "wildlife rescue."

These authors' works have the subjects "mammals," "hoofed mammals," and "birds."

These authors' works have the subjects "mammals," "hoofed mammals," and "animal behavior."

These authors' works have the genre "animal books"; and the subjects "animal behavior," "marine animals," and "whales."

These authors' works have the genre "animal books"; and the subjects "birds," "worms," and "rare and endangered animals."