Which trait is unique to birds

Birds have big eyes. Hawks, eagles, and owls often have eyes actually larger than human's. A human eye weighs less than 1% of the weight of the head, whereas a starling's eye accounts for some 15% of its head weight. A unique bird characteristic.

Explanation:

a axis of a graph is a color or shade so we can all go outside and have a party so we can eat   some grilled cheese sammiches and broccoli and have some ugly fun times

i don't know why i put this, i know its not the i was just bored : p

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climate change and pollution