This is good, but presenting the blobs as such different shapes makes it harder to get a sense of relative size. (Obviously some of the differences are huge enough it doesn't matter, but comparing humans and cattle say.)
And which blob is chickens? I guess chickens are so much smaller and lighter than other domestic animals they don't show very big here.
Another suggestion would be to not include the number of blocks in the label. That doesn’t make sense. If you want an absolute number to be included, but the weight (scaled to millions of tons appropriately). It is less abstract than number of blocks.
Also, this is more subjective, but the font makes it look very amateur in my opinion.
Fair enough, but in a way chickens kinda should be on there anyways. They can't exactly fly very far, spend like 98% of their life on the ground, and humans breed them for food.
There are probably some somewhere, but yeah not many. However the ones that are bred for food typically weigh more.
Hell, if you let a meat chicken grow beyond its sell-by date, there's a good chance it will develop so much muscle mass it cannot stand up anymore, and it will rot to death on the spot.
I'm pretty sure they were domesticated from something (a South Asian jungle fowl, I believe) to the extent that they are no longer even the same species. So any "wild" chickens would just be feral escapees.