Are more animal species edible than plants?
It is estimated by some that on earth there are


  
  7.77 million species (of which 953,434 have been described and cataloged) of animals
  298,000 species (of which 215,644 have been described and cataloged) of plants
  611,000 species (of which 43,271 have been described and cataloged) of fungi
  36,400 species (of which 8,118 have been described and cataloged) of protozoa. 
  


with 6.5 million species found on land and 2.2 million (about 25 percent of the total) dwelling in the ocean depths.[1][2]

Despite the existence of toxic plants and animals, from the numbers alone it is clear that there are more animal species we can eat than plant species.

This does not take into account population or individual sizes, just species.

[1] How Many Species Are There on Earth and in the Ocean?
[2] How many species on Earth? About 8.7 million, new estimate says