adaptation

951

Purple Gallinule
We talk about something being as light as a feather. For the average bird, what percent of its weight is due to its feathers?

956

hawk droppings
The hawk who roosts on our cliff has left plenty of evidence. Why are bird droppings usually white?

968

butterfly
Viceroy butterflies mimic Monarch butterflies. Monarchs are mimics too. What do they mimic?

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