Answer:
I always run but never walk often murmur but never talk have a bed but never sleep has a mouth but never eat.
What kind of dog keeps the best time?
What is easy to get into, but hard to get out of?
When it comes to me you go on red and stop on green.
I am the signature stroll of ducks and penguins
I run through hills. I veer around mountains. I leap over rivers. And crawl through the forests. Step out your door to find me.