They dont have the ability to pick up dinos, but, they can go extremely fast, especially when inprinted when swooping. If you want a fast flyer with a decent amount of weight and fairly high stamina, this is the one you've been looking for.
The Snow Owl’s healing ability is really good for farming blood packs. Just use the syringe as much as you can, then jump on the owl and heal. Bring a lot of food as the healing drains your hunger a lot.
Basically the product of an Argy (high weight and looks like one, minus the corrupted face), Daeodon (healing), and Griffin (dive attack). I would pick these over almost any Extinction creature, besides Velonasaur. And yes, this includes the Managarmr.
So make sure you have it trapped before you try to tame it because it will take off and fly rampant across the whole map and lead you on a wild goose chase, this happens when it is close to being knocked out. This happened to me twice, once it lead me to a giga then flew into its mouth then the second time across the map for 30 mins. Also make sure you use tranq darts because arrows will kill them.
While trying to knock it out, make sure it isn’t too damaged as it doesn’t have too much health, trying to tame it with a crossbow could kill it. If you have a snow owl it makes it easier to tame as it can be healed by the owl (of course to tame it easier you need the creature)