Oh, dude, let me think. Okay, how about "elephant"? Yeah, that's eight letters. And like, "octopus" is another one. Oh, and "platypus" too! So, there you go, three animals that are eight letters long. Nailed it.
Kangaroo has 8 letters
airedale (dog)
Some animals that are 6 letters long are:beaverbadgerbobcatcattlecougardonkeyfalconferretgannetgerbiliguanajaguarlizardlocustmonkeyocelototterparrotpuffinpigeonrabbitrodentspongeturtleweevil
Some animals that are 6 letters long are:beaverbadgerbobcatcattlecougardonkeyfalconferretgannetgerbiliguanajaguarlizardlocustmonkeyocelototterparrotpuffinpigeonrabbitrodentspongeturtleweevil
Parakeet, pheasant and porpoise are animals. They contain 8 letters.
Kangaroo
scorpian
davidblack
bearbirdbullcrowdeerdoveduckfishfroggoatlionmolepumatoadswanwrenwolf
Aardvark Antelope
Whale,
alpacabeaverbobcatcougardonkeyferretgibbonmonkeypoodlerabbit