QUESTION TEXT: The male sage grouse has air sacs…
QUESTION TYPE: Strengthen
CONCLUSION: The scientists think that the ritual (male sage grouse inflating their air sacs) allows female sage grouse to choose healthy mates.
REASONING: No reasoning is given.
ANALYSIS: We need to find some reason why air sacs are a sign of health.
___________
- Those lucky guys. Even though they’re unhealthy, they can still get mates. But what does this have to do with air sacs?
- This doesn’t tell us about air sacs. And it makes things confusing – if antibiotics made the sick grouse healthier, why weren’t they selected?
- This is weird. Shouldn’t those healthy grouse want to show off their air sacks?
- CORRECT. If this is true, then maybe the females can use the ritual to judge whether the men have parasites. It’s easier to see parasite if the sacs are inflated.
- This doesn’t have anything to do with air sacs.
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