Human experts can get enough clues from the bird shape and the context to do that in the sample photos. I doubt your captioning system can.
This is a good example of a standard problem in ML - underestimating the complexity of the problem domain.
You could argue that your system only needs to do the simpler task to be useful, and that's likely true. But if the goal is to approach human expert levels of classification, it needs to improve by at least a few levels.
I suspect getting it there would run into some interesting performance constraints, and possibly some theoretical issues too.
These are way better than anything a non-expert human can do. For example, it can distinguish between the Rhinoceros Auklet and the Parakeet Auklet.
I'm not sure what expert performance is, but around 94% is where humans top out on most tasks.
Also, the parent poster knows what they are talking about: https://www.semanticscholar.org/author/Stephen-Merity/337544...
For example if we could take a photo of Noah's Ark loading up every animal?
Do you just loop through each NN you have on each species?
There's also image segmentation as another poster has pointed to.
In the case of FB face tagging, they'd have learn an embedding space for faces, and when a new image comes in they'd place it in the embedding space along with all the person's connections and find the nearest neighbors.
See https://arxiv.org/abs/1503.03832 or the implementation https://cmusatyalab.github.io/openface/
The research group I am part of, Salesforce Research (formerly MetaMind), have a model that does this "accidentally" - and there's even an example image of a bird[3]! The model is only meant to provide a caption for an image, not to segment the image into the various objects, but learns to "focus" on the bird as part of describing the image. For those particularly interested, check out the paper "Knowing When to Look: Adaptive Attention via A Visual Sentinel for Image Captioning"[5].
Systems made specifically to segment an image into objects would obviously do far better. For an example of that, check out "CRF as RNN - Semantic Image Segmentation Live Demo"[4]. There are many more systems of this style floating about.
[1]: http://imgur.com/a/1UPnn
[2]: http://visualgenome.org/
[3]: http://imgur.com/vbX8NNZ
[4]: http://www.robots.ox.ac.uk/~szheng/crfasrnndemo
[5]: https://arxiv.org/abs/1612.01887