They sent 25 officers and another 20 people from the Royal Society for the Protection of Birds (RSPB) and other agencies to the 25,000-acre Moy Estate south of Inverness.
The RSPB says 40% of red kites found dead in northern Scotland have been killed, mainly by poisoning.
英國皇家鳥類保護協會(RSPB)正在組織一項緊急餵養的行動 以救助那些瀕危的的鳥類,如麻鳽和黃道眉鵐。
Rainham marsh lies on the north bank of the Thames, 30km east of central London, and is maintained by the RSPB as a reserve.
The Northern Rockhopper penguin had been listed as "one of the world's most threatened species of penguin, " according to the RSPB.
Mark Avery, conservation director at the RSPB, said: "the future ownership and management of land that has high public value should be carefully considered."
The groups include Greenpeace, Friends of the Earth and the RSPB.
A grey heron catches a crab at the RSPB Leighton Moss nature reserve, Silverdale, Lancashire.