Twait shad destruction. Conservation of this species is covered by Appendix III of the Bern Convention and Appendix II and V of the European Community Habitats Directive. The twait shad is a typical herring-type fish and much resembles the allis shad. It has no lateral line and the belly is more rounded than that of the sprat and Baltic herring. The gill cover is ridged and the caudal peduncle has large, plate-like scales. This fish is more colourful than the Baltic herring. The back is a bluish green colour and the head brownish with a golden tinge on the operculum. The flanks
Caudal luring Caudal luring Caudal luring is the use of tail movements by a predator to attract prey animals that think the tail is a worm or other smaller prey and approach within the striking range of the predator. The definition of caudal /ˈkôdl/ 1. of or like a tail. 2. at or near the tail or the posterior part of the body. Caudal luring is a form of mimicry classified formally as aggressive mimicry, but perhaps better described by the term feeding mimicry. It is also an example of deception in animals. The behaviour is employed by a number of snake