Exchange traded funds that invest in timber and forestry stocks rose Tuesday in the wake of International Paper’s (NYSE: IP) unsolicited bid for Temple-Inland (NYSE: TIN).

Temple-Inland’s board has adopted a so-called poison pill defense to prevent a hostile takeover attempt, according to reports. The company, which businesses include manufacturing packaging and forest products, said the International Paper bid is too low.

Temple-Inland shares jumped more than 40% on Tuesday, while International Paper gained nearly 2%.

The iShares S&P Global Timber & Forestry (NasdaqGM: WOOD) rallied 3%. The $236 million ETF has 3.4% of its assets in Temple-Inland.

Also Tuesday, Guggenheim Timber ETF (NYSEArca: CUT) climbed almost 2%. The fund counts International Paper as its second-largest holding at 5.3% of the portfolio.

“The deal would represent another huge consolidation step in the containerboard industry and would give International Paper almost 40% of the containerboard market,” said Deutsche Bank analyst Mark Wilde, although he added a transaction seems “very unlikely” at the current proposed price.

“We view International Paper’s bid as an ‘opening salvo’ and suspect that there will ultimately be a deal, but at a higher price,” Wilde said.

iShares S&P Global Timber & Forestry