Antique Vintage Bronze Brass Bird Sculpture Brutalist Art Pablo Picasso Era

Greetings!
Who or what in the world made these strange birds? My wife and I have tried our best to research these birds with no luck. They are very heavy, together they weigh about 8 pounds. Size is about 5.5"tall down to about 3.5"tall. I think they are solid bronze or brass, a magnet does not stick to them. They have some areas of patina. They are a brutalist type art, sculptures or paperweights. I may not be able to reply to all who respond, but want to Thank You all in advance for any help and your comments.