injured blue jays birds?

See if there is a wildlife rescue in your area. They know exactly what to do.

Although it's good that you care about birds, in general it's best to leave injured wild birds alone--it takes a lot of effort, and doesn't always save the animal's life. There are very limited resources at animal shelters, and the effort is better spent protecting rare and threatened birds. Blue jays are a very common bird, not in any chance of being endangered.

In general, blue jays are very intelligent and resourceful birds--if your cat was able to catch one, the jay was probably being too bold, reckless, or was already injured. Predators are actually beneficial to many bird populations because they keep the birds alert and kill off the weaker ones that might easily be killed by another predator like a hawk or fox. A bird that could be caught by a household cat could easily be caught by any number of wild predators, even ones found in suburban neighborhoods.

The one thing that you might want to check is whether or not your cat is getting into birds' nests. Some cats will destroy birds nests either to eat the young or to attract and then kill the adults when they try to protect the nest. Blue jays are very aggressive at defending their nest--I have seen them attack cats and large hawks before. This could explain how your cat got the jay--if this is the case you might want to take some precautions to see if you can keep your cat out of the trees containing birds' nests. This can be difficult, however, if you have an outdoor cat.

try to go get the bird and take it to your town vet or if you have a animal rescue thing take it to them