Simplify the following text for a Grade 5 native English-speaking person.
Original: The walrus ' body shape shares features with both sea lions ( eared seals : Otariidae ) and seals ( true seals : Phocidae ) .
Simplified: Like both true seals and eared seals , they are very good swimmers and divers . However , walruses do have some features that neither true seals nor eared seals have .