Can i put a new baby bearded dragon in with an adult?

Answers:
No- the adult will eat the baby.

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I wouldn't recommend it as the adult may eat the baby. Plus you don't want to bring in a new "outsider" and let it "mix" with your dragon as it may have parasites. It is always best to keep new reptiles isolated from the rest for the first few weeks until you are sure they are not sick.

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READ THIS! I have an adult beardy who is a year old. Whenever I get pinkies and I put them on a dish right next to the tank before i put them in, she goes crazy at the glass and eats it right when i put it in. I got a baby beardy a while back and was about to put her in, when i decided to put it next to the glass to see what the older one would do. She did the exact same thing as she did for a pinky. She would have gobbled that baby up for sure if I would have put it in there.

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No, bearded dragons should be housed alone. One will usually try to dominate the other, causing stress or injury.

http://www.beautifuldragons.503xtreme.co...
http://www.reptilerooms.com/
http://www.biology.lsa.umich.edu/researc...

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there is no chance at all that the adult will NOT eat the baby. the best you can hope for is that the adult won't eat the baby IMMEDIATLY. he might wait till the baby climbs on him, and then eats him out of annoance.
although, as orrible as this sounds, it's kind of almost interesting to think of how the heck an adult beardie would slide a baby down... i mean... even babies are a lot bigger then crickets.