You won't find the word ‘love' in the published papers of scientists who research non-human animals. Ironically, though, most animal behaviour scientists were drawn to the subject because of their deep and abiding interest in them.
And yet, generations of researchers have been trained not to use anthropomorphic words like ‘love' to describe something a non-human animal might be feeling.
Indeed, the use of anthropomorphisms (descriptions of non-human behaviour or characteristics with terminology used to describe humans) has long been condemned in the