Subjects: ANIMALS; HUMAN beings; SPECIES
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Subjects: GREENHOUSE gases; BIOLOGICAL extinction; ANIMAL rights
Subjects: ANIMALS; WORMS
Subjects: ANIMAL intelligence; TRICKS; METACOGNITION
Subjects: ANIMALS; EMOTIONS; ANIMAL psychology
Subjects: ANIMAL intelligence
Subjects: MULTICELLULAR organisms; HOMO erectus; ANIMAL intelligence
Subjects: ANIMALS; ANIMAL behavior; BEHAVIORAL scientists
Subjects: CHICKEN as food; ANIMAL products; MEAT
Subjects: NATURAL history; ANIMAL welfare; FISHING boats