source: TFP-WebServer/WebServer/src/LiveData/Animals.cs@ 440

namespace Webserver.LiveData {
        public class Animals : EntityFilterList<EntityAnimal> {
                public static readonly Animals Instance = new Animals ();

                protected override EntityAnimal predicate (Entity _e) {
                        if (_e is EntityAnimal ea && ea.IsAlive ()) {
                                return ea;
                        }

                        return null;
                }
        }
}