Ah now I understand, you're not arguing that the species name should be pluralised (that would be silly), but what you do not like is the use of the singular species name at all.
Maybe it's more popular in the UK (although I've seen the same usage in the US), but in the UK I'm sure the majority of birders would have no trouble with the phrase:
"Today I had Red-breasted Flycatcher"
And it's actually very useful to use the species name because it gives an extra level of expressiveness for example:
"Today I saw Red-breasted Flycatcher" (one or more)
"Today I saw a Red-breasted Flycatcher" (one)
"Today I saw some Red-breasted Flycatcher" (more than one)
The first phrase becomes unwieldy when using the colloquialism:
"Today I saw one or more Red-breasted flycatchers"
It's a small point, but using the species name allows you to say you saw a species without having to bring complications of numbers into it.
If I was talking to a birder I would say/write:
"I had Common Sandpiper by the beach"
If I was talking to a non-birder I would say/write:
"I saw some common sandpipers by the beach"
If you use the colloquialism you should be sure not to capitalise it, as it is not a proper noun. I think most scientific papers eschew the English species name (I assume due to standardisation only recently, and to deference to the scientific name). Here is an example of a scientific paper correctly using the colloquialism and note lack of capitalisation of "great tits" and "blue tits":
http://www.ncbi.nlm.nih.gov/pubmed/...med_ResultsPanel.Pubmed_RVDocSum&ordinalpos=4
So we can all use what we prefer, species name (correctly capitalised and singular) or colloquial name (correctly lower case and singular/plural as per the number of birds present). But certainly there should be nothing "wrong" or "irritating" about using the species name.
:t: