Past the beginning of Winter they will grow one of the 3 variations of Deer Antlers. They will, however, despawn around the end of the season unless they are near a players' base.
Behavior
No-Eyed Deer will spawn 3–5 days into Autumn. They will not spawn on craftable Turfs, Savanna Turf, or Marsh Turf. They will always spawn as a group away from all players. The herd always stays together and all animals move exactly in the same direction.
As Winter starts the No-Eyed Deer will start migrating, growing their antlers after about 1 Day. If the No-Eyed Deer collides into an object such as a Tree the antler will break off. Within 2 days before or after the end of Winter, No-Eyed Deer will despawn unless they are within 1.5 screens (7.5 Pitchfork tiles) of at least 10 player Structures or Walls.
No-Eyed Deer will not run away from the player if approached, but will be startled. If attacked, they will flee.
Trivia
They were added in the Herd Mentality update.
"No-Eyed Deer" is likely a pun on the phrase "doe-eyed", which is commonly used to describe eyes of deer. The name also resembles the phrase "no idea".
Possibly, the No-Eyed Deer could be a depiction of the "blind" in the proverb "The one-eyed man is king in the land of the blind," with Deerclops representing their king.
Before the "Winter's Feast" update the No-Eyed Deer used Volt Goat's sounds and were neutral, attacking players in groups similar to Beefalo.
The functional versions of the collared No-Eyed Deer were first shown on Rhymes with Play #116[1] and later released as the Gem Deers.
Attention: The following categories are only for the players look up the page based on their first impression, they have nothing to do with the actual categories/behavior/function/tags of these creatures
Attention: The following categories are only for the players look up the page based on their first impression, they have nothing to do with the actual categories/behavior/function/tags of these creatures
Attention: The following categories are only for the players look up the page based on their first impression, they have nothing to do with the actual categories/behavior/function/tags of these creatures
Attention: The following categories are only for the players look up the page based on their first impression, they have nothing to do with the actual categories/behavior/function/tags of these creatures
Attention: The following categories are only for the players look up the page based on their first impression, they have nothing to do with the actual categories/behavior/function/tags of these creatures
Attention: The following categories are only for the players look up the page based on their first impression, they have nothing to do with the actual categories/behavior/function/tags of these creatures
Behavior
