In the last trading session, Wall Street was downbeat. Among the top ETFs, (SPY Quick QuoteSPY - Free Report) lost 0.2%, (DIA Quick QuoteDIA - Free Report) retreated about 0.1% while (QQQ Quick QuoteQQQ - Free Report) moved 0.1% higher on the day.

Two more specialized ETFs are worth noting as both saw trading volume that was far outside of normal. In fact, both these funds experienced volume levels that were more than double their average for the most-recent trading session. This could make these ETFs the ones to watch out for in the days ahead to see if this trend of extra-interest continues.

(WIP Quick QuoteWIP - Free Report) : Volume 2.46 Times Average

This international TIPS ETF was under the microscope as about 148,569 on shares moved hands. This compares with an average trading volume of roughly 60,300 shares and came as WIP lost more than 2% in the last trading session. WIP is down 7% in a month’s time.

(REM Quick QuoteREM - Free Report) : Volume 3.26 Times Average

This mortgage real estate ETF was in the spotlight as around 3.07 million shares moved hands compared with an average of 1.09 million shares a day. We also saw some price movement as REM lost 4.7% in the last session. REM has slumped 21.3% over the past month.