▁Gra zing ▁Act ▁of ▁ 1 9 3 4 . ▁B LM ▁author izes ▁liv est ock ▁gra zing ▁on ▁these ▁lands ▁by ▁issu ing ▁perm its . ▁Section ▁ 3 ▁lands ▁make ▁up ▁the ▁vast ▁majority ▁of ▁B LM - admin ister ed ▁lands . ▁ ▁References ▁▁ ▁Category : Un ited ▁States ▁Department ▁of ▁Agricult ure <0x0A> </s> ▁The ▁northern ▁sc ream er ▁( Ch a una ▁ch av aria ), ▁also ▁known ▁as ▁the ▁black - ne ck ed ▁sc ream er , ▁is ▁a ▁large ▁species ▁of ▁bird ▁in ▁the ▁small ▁family ▁An him idae , ▁the ▁sc ream ers . ▁It ▁is ▁a ▁resident ▁bre eder ▁in ▁northern ▁Colombia , ▁in ▁Ch oc ó , ▁Ant io quia , ▁C ór dob a , ▁Su cre , ▁Bol í var , ▁Mag dal ena , ▁Sant ander , ▁and ▁Ces ar ▁Depart ments ▁and ▁north western ▁Venezuela , ▁in ▁Z ul ia , ▁M ér ida , ▁and ▁Tru j illo ▁States . ▁On ▁average , ▁they ▁are ▁ 8 8 . 9   cm ▁( 3 5   in ) ▁long ▁and ▁we igh ▁about ▁ 3 . 9   kg ▁( 8 . 6   lb ). ▁ ▁They ▁are ▁designated ▁as ▁Near ▁Th re aten ed ▁due ▁to ▁agricult ure , ▁transport ation , ▁bi ological ▁resource ▁use , ▁water ▁management , ▁and ▁poll ution ▁from ▁waste ▁water ▁and ▁industry . ▁ ▁Capt ivity ▁F ew ▁zo os ▁keep ▁the ▁northern ▁sc ream er ,