I'm not a compiler (unless compiling the rules counts me out), so I'll try, too:
Lessee, there are more than 8000 species world-wide. We have every continent except Antarctica represented, along with a very wide variety of habitats, from the Himalayan foothills in Nepal, to the saltpans of Western Australia, the North Sea, northern Canada and Alaska, the Arabian peninsula, northern and central Europe, South America, Mexico and El Salvador, the east and west coasts of the US and many spots between, and remarkable coverage of the UK (and that's just what I can remember right now). There's going to be coverage of some places with an amazing diversity of species, and most people are going to be looking hard.
Plus, early May is migration season in the Northern Hemisphere.
So, at a guess, I'll go with 1249.
And, while not intending to give our compilers any suggestions -- they have a huge job already (!!) with just compiling a grand total, would it be interesting to know which species were seen where? For example, Northern Cardinal will be seen by folks throughout the eastern and central US, but how far west? Mallard is probably the most globally common duck species: how many different locations will pick it up?
Assuming we repeat this count another time, it would be interesting to perhaps have someone take a look at our lists to come up with this kind of information.