| How can penguins tell each other's gender apart? | 2 | | | | |
| Why didn't large herbivorous dinosaurs have feathers? | 2 | | | | |
| Will a person with animal allergies be allergic to closely-related animal species? | 1 | | | | |
| Why has nothing like humans ever evolved elsewhere? | 1 | | | | |
| Why aren't deer, cows, etc., considered omnivores despite sometimes eating meat? | 1 | | | | |
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