1. A collision avoidance assistance device for a vehicle comprising: a camera configured to acquire an image of an area around the vehicle; and a controller configured to: detect an image of a tetrapod in the image of the area around the vehicle; determine a species of the animal tetrapod detected in the image; retrieve behavior characteristics index values representing behavior characteristics of the determined species of the tetrapod; calculate a future presence area of the tetrapod based on the behavior characteristics index values; determine a probability of a collision between the tetrapod and the vehicle based on the calculated future presence area of the tetrapod; and perform a collision avoidance assistance function based on the determined probability of the collision between the tetrapod and the vehicle.