Which mode of pollination would you least expect to find in a dense tropical rain forest? 

A)  bird 
B)  bat 
C)  butterfly 
D)  wind

In a dense tropical rainforest, the vegetation is so dense that wind cannot easily penetrate it. As a result, wind pollination is less efficient in such an environment, and is hence less likely. In contrast, birds, bats and butterflies are commonly found in tropical rainforests and are known pollinators for many plant species there.