* Foxes: A fox's bark or yelp can sometimes sound quite similar to a high-pitched whinny, especially when they are excited or alarmed.
* Some Birds: Certain birds, like the black-billed cuckoo or the common loon, can have calls that resemble a horse's whinny in their mournful or haunting quality.
* Young Horses: Foals will often make a high-pitched, almost "bleating" sound that can be reminiscent of a horse's whinny, but softer and more drawn out.
It's important to note that these are just *similarities* in sound. The exact pitch, volume, and context of the sounds will be quite different.