Plural of "deer"

It should be "deer" in this case. Generally the only time you'd see "deers" (or "fishes", etc.) would be when someone was talking about several distinct species.

Thank you, CSnyder.

There are three species of deer in the South Loch Ness area.

Do you mean that it would be correct to say "three species of deers" mean three species of deer?

Actually you'd only see it in very specific wording referring to e.g. specific taxonomic classifications of deer. I can't come up with a good example for deer in particular, perhaps because I'm not as up as I should be on deer taxonomy, but it isn't unusual to see, for example, someone talking about the bony fishes versus the cartilaginous fishes.

HUBLOTThank you, CSnyder.

There are three species of deer in the South Loch Ness area.

Do you mean that it would be correct to say "three species of deers" mean three species of deer?

The plural of 'deer' is also 'deer', so it is incorrect to say 'three species of deers'.

Thank you, Yoong Liat.