Seals (mammals) and penguins (birds) both have streamlined body forms that allow them to move through water efficiently. This similarity in body shape is mostly likely the result of: convergent evolution.
A streamlined structure can be considered as the hybrid of needle and a sphere. This form of body reduces the friction of the frag created when the animals moves in wind or water and therefore eases the movement of the organism.
Convergent evolution is the one where two organisms have the similar anatomical features due to their adaptations in the habitat. However, such animals do not have any ancestral relation.
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