Question
Hello There is a tree in my Houston yard that I thought was a type of Oak with small leaves, it now has very small purplish berries that are sweet. There are at least one hundred mourning doves on it eating these berries. 25-35 feet tall

Answer
I can not id the tree from your discription but if you can send me a picture of the breeies and the leaves I should be able to help. [email protected]
You could check with the Houston Urban forester and I am sure they could help. Here is the contact information for them.
Houston - Mickey Merritt
(713) 688-8931
[email protected]

Houston - Dallas Singleton
(713) 688-8932
[email protected]