Google will get to apex predator if I search "what predator is at the top of the food chain?" or "what type of animal is at the top of the food chain?" but it

Google will get to apex predator if I search "what predator is at the top of the food chain?" or "what type of animal is at the top of the food chain?" but it fails to do so if I ask "what consumer is at the top of the food chain?" It seems like "consumer" is too ambiguous to work in this example.