What similarities do birds and reptiles share regarding external coverage, reproduction and excretion?

What similarities do birds and reptiles share regarding external coverage, reproduction and excretion?
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Regarding external coverage, birds are similar to reptiles as they present impermeable keratinized coverages. Concerning reproduction, in both fecundation is internal and the embryo develops within a shelled egg. Regarding excretion, both excrete uric acid.
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