Seems like they're specifying non-flying mammals:

The behaviour is interesting because it shows nectar-feeding and pollination by non-flying mammals might be more widespread than currently recognised, and that the ecological significance of these lesser-known pollinators might be more important than we think,” says Lai. “It’s very exciting.

If I'm not mistaken this is at the entrance to Universal in LA. If not, there was one like it there.

Dress for the job you want, not the job you have

Not all heroes wear capes