
Otter
A slippery wrestler who treats rivers like gyms.
Otter vs Kangaroo
Tonight's science rumble is set in the visitor lawn, now closed for SCIENCE. No snacks were harmed.
Otter
Lontra canadensis
River otters can stay underwater about 4 minutes.
Fish, crayfish, frogs — they eat lunch in the pool.
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.