Face of possum, tooth of mouse, ear of bat—it’s not a line from Macbeth, but it just might describe the world’s weirdest primate. Meet the aye-aye (Daubentonia madagascariensis), a lemur so singular ...

They can present on their own or as co-morbidities with other disorders. Like humans, non-human primates (NHPs) can develop depression- and anxiety-like signs. Here, we first define human depression ...