When I used to plant melons, I would have trouble in the dry season.
Crows would peck at fruit to get water, and they seemed to like the
melons best. I got some stakes and tied some 8 pound monofilament fish
line on them at a height of about 3-4'. The fish line I used had a
slight fluorescent blue cast, otherwise it was transparent. The line was
strung in parallel rows about 5' apart throughout the melon patch.

What seemed to happen, was that the crows' eyesight was good enough to
see that there was something there, but not good enough to see what it
was (blue is not focussed well by human eyes, so it's possible that the
same problem occurs in birds). And since it was above them when they
were in the melon patch they didn't like it. I had no problems with
crows in the melons. (melons that grew out of the covered area got
pecked.) This is my guess as to why it worked, but it did.

I have not tried it in strawberries. Part of the problem there is that
the strawberry damage is done by smaller birds and by rodents. The small
birds are maneuverable enough to avoid the fishline, so it probably
won't bother them. The rodents don't seem to look up much (so that they
provide food for our local hawk). Consequently I don't think it would
work on strawberries, but it's cheap and easy, so you might try it. If
you do, let us know how it works.