There were at least one other feral street drain related work from memory. One with wind blowing really hard. This also ties in with the feral street scene diorama piece: Feral Fluffies in an Alleway (artist: Carpdime)
Foals falling into drains is such a low hanging fruit for feral works. Might be related to a primal fear of being a kid and worried about getting lost down a drain.