It would be nice to repeat the maps using weight. The weight of a cow is like 700Kg (1500 pounds) and the weight of a chicken is like 3Kg (6 pounds). So a cow is like 250 chickens. (Can someone with CGI abilities make a gros image of a cow made of 250 chickens?)
I've seen another image which shows cubes indicating total biomass inclusive of plants and invertebrates. Humans aren't quite so prominant on that, though as a measure of all animal biomass, still a large fraction.
This ... is close though not quite what I had in mind:
About the last graph from xkcd: It's weird that is does not include chickens! As discussed in a sibling comment, raising a chicken takes 1/10 of the time of raising a cow, so I guess the current biomas is misleading lower.
One is the instantaneous biomass at any point in time.
The second would be something like "rate of new biomass formation".
A human lives ~82 years, a cow lives ~3, a chicken lives ~6 weeks (for a fryer or broiler). The human lives ~715 times longer than the chicken, but weighs only 30 times more. There's nearly 25 times more chicken biomass cycled per year than human.
(The fact that that chicken biomass goes to feed the human biomass is also a part of this, of course.)
Calories could be a good measure - a whole chicken appears to be about 1200 and a cow between 500,000 and 600,000 - so a cow is about 500 chickens or so.
Calories is a great metric. Better than mass. However, what I really want to see is calories produced per a unit of time. It takes about 8 weeks to raise a meat chicken and about 80 for beef cattle. 1 Cow = 50 chickens.
