Are strong in packs, do a bleed effect and can latch onto surfaces, it is tamed by stealing its eggs and raising them, it can take 9 to 10 standing torches. Eggs are found in the whites cliffs area ONLY on the valguero map. Like if helpful
People on here are giving the most difficult tips to get the eggs. Just fly down there. Hop off when non is too close. Grab the egg. Fly away. It's as simple as that. No need for an argentavis with bait
Everyone seems to think they're only in Val. They're all around the lower valley type areas near the castle on the east side of Fjordur too. I've raised many of them there. They're easy to get, just take a decent mount with lots of health and melee damage. You can easily take out the packs defending the nests just make sure you pick up all of the eggs no matter what level or they won't respawn. Just dispose of the lower level eggs.
You can't tame these guys by knocking them out. Instead, you need to steal their fertilised eggs (just like wyverns and rock drakes), hatch them and raise them, just a bit harder than knocking them out. The eggs can, of course, be found in their nests and do be careful while trying to steal one as the Deinonychus is very territorial. Hope this helps :)
Here's how to steal one early game: If you spawn in at chalk hills 3 and spawn next to a pond walk opposite to the pond. There are some nests right there. Snatch one quickly and run off the cliff next to the pond. Be careful and make sure to fall into the water. From there make a left and you should get to a beach area. From there it should be easy to find your base.
Finally are on another map, near the hexagonal stone cliffs you can find these miniature allos and their nests. This map for me is currently easier to grab than valguero simply because of the amount of other dinos in the area. THANK YOU FJORDUR