JimVertebrate Control and ExclusionDecember 13, 20160 Likes Excluding a Chickaree in Camp Connell Here are some photos by Jason Mink of a chickaree exclusion setup, for a cabin in Camp Connell. That is a one-way valve in the center; it lets the Douglas squirrel out, but it cannot get back in. 12 December 2016. Chickaree one-way valve, Camp Connell. Chickaree one-way valve, Camp Connell.