the types of nests they build the lengths of their tails the shapes of their beaks the colors of their feathers
I gave my students this multiple choice question: A few types of birds live in the same ecosystem. Which of these characteristics would most likely affect how they compete with each other for food?

Only one answer is correct among these 4 choices:
- the types of nests they build
- the lengths of their tails
- the shapes of their beaks
- the colors of their feathers

Could you tell me which one is correct?

the shapes of their beaks