UFO over Lake Michigan, Indiana, on May 2018

On May 10, 2018, a witness has caught a picture from car of Lake Michigan, Indiana. Later, he saw something strange looking like a UFO

Witness statement:

I was arriving at Washington Park around 3pm CST. I took a photo through the windshield of my car just NW of Chicago which is about 39 miles away. I sent it to my friend to show him how calm the water was. Later that night he told me he got the photo but asked what that object was in the distance? I said what object, that it was the lighthouse. He told me to go back zoom in on the photo I sent, just off the lighthouse in the distance and to zoom in. He did it to see if he could see the Chicago skyline in the distance which he could not. I never noticed it until he pointed it out so it had to have been far out into the lake. Once I zoomed in it looked huge for the size and distance it appears to be in relationship to the lighthouse? I cannot tell in the photo if that is a seagull flying in the photo at the top of the object a cloud or some type of smoke? Or it might simply be the wing of a seagull but if so in the photo it looks to be out of proportion to what might be a bird in flight in the photo if that is what it is?

https://mufoncms.com/cgi-bin/report_handler.pl?req=view_long_desc&id=91951, 12th May 2018