Dart and dart retainer

1. A dart comprising

a body, the body defining a chamber having a plunger and a striker pin located therein, the striker pin configured to operatively strike a primer for actuating the plunger when the dart hits an animal to operatively deliver a substance through a hypodermic needle extending through a front end of the body, and

a retainer comprising a barb body locatable on the hypodermic needle characterised in that the barb body is threaded which prevents the dart from being dislodged from the animal until the dart is removed by a user while allowing the user to remove the dart when the animal is inhibited by imparting rotational force resulting in minimal damage to a tissue and skin of the animal.

2. The dart of claim 1 , wherein the body includes a stabilising member connected to a tail of the body for stabilising the dart in flight when the dart is discharged from a weapon, and an annular member connected to the stabilising member at a rear end of the stabilising member.

3. The dart of claim 2 , wherein the striker pin, the primer and the plunger are disposed in an insert.

4. The dart of claim 2 , wherein the annular member is substantially a same circumference as the front end of the body.

5. The dart of claim 4 , wherein a circumference of the body decreases towards the annular member.

6. The dart of claim 2 , wherein the stabilising member is a plurality of fins helically arranged relative to the body to cause the dart to operatively spin along a longitudinal axis of the dart; and wherein an orientation of helices of the fins and the barb body is the same such that a direction of spin of the dart corresponds to a thread orientation of the barb body to facilitate entry of the barb body into the animal.

7. The dart of claim 1 , wherein the front end of the body includes a shock absorber member.