
Walrus
A tusked sofa that rules the ice.
Walrus vs Kangaroo
Tonight's science rumble is set in the visitor lawn, now closed for SCIENCE. No snacks were harmed.
Walrus
Odobenus rosmarus
A walrus mustache has hundreds of whiskers, each a sensor.
Clams, mostly. Sensitive whiskers find shells in the dark mud.
Kangaroo
Macropus rufus
Kangaroos cannot hop backward. The contract with physics is one-way.
Grasses and shrubs. They are hoppy lawn mowers.
Who do YOU think wins?

Kangaroo
Boxing champ with built-in trampolines.