Fish are unusual,but birds dropping [...]
@sneakypete Actually, while it is not usual, it is fairly common around here.
Eagles and ospreys often try to catch fish bigger than they can really lift... They'll get them up and off a ways, and then figure they cannot pack it, and just drop it right there.
Another thing that is just as common is one eagle/osprey attacking another, forcing them to drop their prey to defend... Where upon the prey is snatched up by the usurper... Albeit that often times, neither gets the prize as it plummets to the ground.