In the last trading session, Wall Street lost strength. Among the top ETFs, SPY declined 3.6%, DIA retreated 3.1% while (QQQ Quick QuoteQQQ - Free Report) moved 5% lower 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.

BAB: Volume 3.85 Times Average

This municipal bond ETF was in the spotlight as around 2.26 million shares moved hands compared with an average of 587,750 shares a day. We also saw some price movement as VHT lost 0.9% in the last session. VHT has plunged 4.8% over the past month and carries a Zacks ETF Rank #4 (Sell) with a High risk outlook.

DGRW: Volume 4.26 Times Average

This large-cap value ETF was under the microscope as nearly 2.80 million shares moved hands. This compares with an average trading volume of roughly 656,000 shares and came as DGRW shed 2.6% in the last trading session. DGRW is down 3.5% in a month’s time and has a Zacks ETF Rank #2 (Buy).