kangaroo
a yak
urubu
Quail
my favorite thing to do that start with a j is to go on journey which means travel around the world.
There is New Jersey but that is the closest thing to a state starting with the letter "J".
Koala
A Venus flytrap.
Quartz
jump rope, Jack Russell Terrier
Quail
Juicer, or Julliene Fry maker