A forestry device is provided. The forestry device, for example a bunching and felling head, is configured to group trees. The device comprises a support frame and an accumulation area located proximate to the support frame. The device includes at least a first arm rotatable relative to the support frame, to gather trees, and at least one accumulating arm rotatable relative to the support frame, to secure one or more trees in the accumulation area and to retract from the accumulation area to allow a newly gathered tree to be added in the accumulation area. The one or more accumulating arm(s) include(s) an inner arm pivotable relative to the support frame and an outer arm pivotable relative to the inner arm. The outer arm is provided with at least one articulation dividing the outer arm into at least a proximate member and a distal member.
