I think we should talk to them.

[Celestia drops down from her own inquisitive hover in midair to land next to him, still regarding the enclosure thoughtfully. She isn't exaggerating or being metaphorical either; though animals in the Near Shore often seem quite less intelligent than their Equestrian equivalents, she believes they can get through if they try.]

At the moment, I see nothing suspicious that would make their problem obvious, so best we go to the source.