I just want to point out that this is a study about biology, from Texas.
Anyone even remotely connected to the textbook industry will recognize this as a bad sign. If you don't know how Texas (and therefore US) textbooks are influenced by the Texas educational system, especially in the field of biology, take a few minutes to read up on it. The details won't be hard to find. Count the seconds until you're horrified.
So yeah, based purely on my past experience, a biologist from Texas could tell me frogs were green and I wouldn't believe them purely out of habit. So a study about freaking Bigfoot doesn't stand a chance.