Animals of the deer tribe seem to have a deep sense of any wrong done to any member belonging to them, and to show a determined disposition to avenge that wrong at the first opportunity. Captain Brown states that, ‘At Wonersh, near Guildford, the seat of Lord Grantley, a fawn was drinking in the lake, when one of the swans suddenly flew upon it and pulled it into the water, where it held it under until it was drowned. This act of atrocity was noticed by the other deer in the park, and they took care to revenge it the first opportunity. A few days after, this swan, happening to be on land, was surrounded and attacked by the whole herd, and presently killed. Before this time they were never known to attack the swans.’

— Vernon S. Morwood, Wonderful Animals, 1883