They look pretty big and fat and juicy to me, and pretty slow moving and loud and therefore easy to catch, so why don’t the birds tuck into them?
The site below suggests that all kinds of things will eat cicadas, but I’ve seen lots of even dead ones lying around uneaten in Japan and birds and cicadas in the same tree without one even attempting to eat the other:
Different species? Poison? Just no suitable animals in the area I’m in?? Such an overwhelming number of the fat gits that the birds and squirrels get sick of eating them? Too big for delicate insect eating mouths?
Doesn’t answer my question, but the best article on cicadas I’ve found so far is: