Problem is that there are lots of critters called "daddy long legs." Some are spiders. Some are not. Look here for a discussion

If your beetle is that big, I think it must belong to a special group of BIG longhorned beetles. Click here, BIG ONES to get to 13 pages of small thumbnail photos. If you see one that looks like your beetle, click on that photo and you will see it in large size on its own page.

Some of these big longhorns are widespread and some are only in a few states. Let us know if you think you've found it.

I found this bug in my dogs water dish, its about 2.5 inches long about the color of an old penny with lite shiney sparlkles, 6 legs, and really big antenas, i think he has wings, my mom told my to check it out and learn what it was, and I found the matching picture of it,Micranoplium unicolor, its alive,what does he eat?, does he bite?, can he fly?, is he rare for a NJ bug? I`m only 7 and I think bugs are really cool.

Maria, your mother is very wise. In telling you to "check it out" she has started you on an adventure. I had a mother who did the same and I am still exploring the world.

I agree with Jim that your beetle is probably not this species. Look through some of the other species in this family and see if you can find something similar but about the size of yours.

The truth is that we know very little about what many beatles eat. Micranoplium has only been collected as an adult attracted to lights and we have no idea what the larva or the adults eat. Many species of long-horned beetles don't eat anything as adults although some are attracted to sap flows at wounds in trees. That is why Jim suggested trying sugar water.

Yes, beetles can fly.

No, they usually don't bite although I have had some minor pinches when I was holding them. More often their feet dig in to my skin. If you look closely at the beetles feet you will see that they probably look like tiny grappling hooks. Rather than depending on gravity and friction for their footing, beetles use hooks to cling to surfaces. It works well for things like trees and window screens but not so well on glass. :)

Keep your eyes (and ears) open, you never know what suprising things you will observe in the world around you.

The photographer described it as small. You said yours is really big.
Chances are your big beetle will not eat anything. Many adult longhorned beetles don't eat anything and live for just a week or two. However, try seeing if it is interested in some watered-down honey, syrup, or molasses.