umm... are you SURE it's not fake? LOL it looks fake.... the more I look at it the more convinced i am that it's fake... but what the heck.
ok... why I don't think it's a bird-
1. the overall shape of the head. it's too wide and flat
2. I'd think that the beak would still be there
3. I see the places where the teeth should be. see those holes?
4. the cranium is too big
now... you say you found it on a beach... which would explain the lack of the ... the.... darn it... well, the eye bone thing and the missing teeth. I've found two skulls and on both of them the front teeth were either about to fall off or gone. Front teeth only have one root (unlike molars.. which have two or three) and are pretty easy to pull out. also- with all that rolling and bumping and stuff it was eroded and the eye socket bone was broken off.
I don't think it's a reptile skull anymore because the front teeth wouldn't be so big... unless it had huge teeth compared to it's size.
so... that leads me to say it's a mammal...
it's definately not a rodent because rodents have big teeth and they go ALL the way back to the back of their skull. the size of the teeth holes would be bigger, and it would probably still have teeth because they go so far back.
I also dubt that it's a hervivore because I can't think of any hervivore with a head that looks even remotely to that.
so... if it's not a bird, fish, reptile, rodent, racoon (I have a racoon skull), or hervivore... what is it?
where the hell is the nasal cavity though? and what's up with the back of the head? that raised thing wouldn't allow much movement of the head would it? and why can't I see the raised thing in the second to last picture?