Waiiit a minute! Using the Tasha rules, these can be spellcasters! I’m thinking cleric of a moon god or druid.

a character should not really "ride" a large bird in the traditional sense if we are being scientifically accurate as that much weight being on it's back would negatively impact it's ability to use it's wings. it would be far easier for the bird to lift the character up in it's talon's possibly with the use of a special clothing item to protect the characters shoulder's. but yes a giant Owl can be used to transport a character.

Quote from NebulanKeltaz >>

I can't get past the fact that giant owls have better stealth than regular owls. How is a large beast stealthier than a tiny version of it? 

I know that In 3.5e a smaller character/monster always got a bonus to it's stealth (and some other) rolls against a larger creature because of it's size which was factored in later since it was dependent on the size of the other creature. IE a halfling a small creature got a +1 to stealth against medium creatures and a +2 to stealth against large creature. I do not know if this is an official rule in 5e, but it could be used as a varient rule.

My Level 6 Wizard has one as a sidekick. It is awesome! 

Quote from Sl4pch0p >>

They have it wrong here. Officially, it states the following:

• Languages Giant Owl, Understands Common, Elvish, And Sylvan But Can't Speak

So Giant Owls can understand and speak Giant Owl. However, they can only understand (not speak) Common, Elvish and Sylvan. The real question is... can they write in Giant Owl?

 The real real question is... if you had telepathy, could you telepathically talk back and forth with an owl via common, elvish, or sylvan? 

Owl speaks in rhymes

I used one for a half elf is that right?

Quote from soooo >>

I used one for a half elf is that right?

 Used one? What do you mean?

iygv76ytuytg]'[/[;

Quote from NebulanKeltaz >>

 

Quote from Crownguard2 >>

Lets say i use conjure animals and summon 8 Giant Owls, can my party ride them to wherever we want?

 

 

For 1 hour at a time... until you run out of spell slots... sure! (I wouldn't put it past your DM to make you roll some DEX to make sure you stay on the owls since they don't exactly come with saddles or riding gear. )

 
Indeed, you only get an hour at a time, but they fly quite swiftly, and they're strong enough to hold on to most party members.  

However, it does get a bit more complicated when you have members of your party that weigh more than 300 lbs.

Also, your party will make quite an impression on people if you land in front of town being carried by giant owls.  My party is called the Owl Riders for this very reason.

wait is giant owl sentient?

”Hoot” knows, maybe they have their own hidden owl civilization (kinda like owls in “Guardians of Ga’hoole”)

This owl dummy thiccccccc

They can speak Giant Owl, but the language only has one word: "Who?"

dos owlin have the Languag Giant Owl

whats its size?

i shall awaken one of these things, then i shall give it a library and then (notices there int stat) damn.

Quote from passthepopcorn >>

i shall awaken one of these things, then i shall give it a library and then (notices there int stat) damn.

 It's as intelligent as an average adventurer...

Wait. That's an insult not a compliment!

Quote from DuncanAnimations >>

owl?

 owl!

I am making a tribe in my dnd world that are going to fly these things to war(The Owl Riders) and going to have an entire religion based off of owls(Owlishm)