Since even the most naive viewer has worked out by now that some nature documentaries are not created by cameramen wandering about aimlessly in the countryside and hoping for a glimpse of a rabbit, World In A Wood (Pearl, 8.30pm) should not shock anyone. There are cameramen wandering the most desolate corners of the globe and risking life and limb to film rare animals: those poor guys stuck on the Siberian island, for example. But when the BBC wants footage of an owl feeding its young, or field mice making love, they quite often head for Wytham Wood, a 41-hectare plot that has belonged to Oxford University since 1943, when it became a huge research laboratory. Scientists have been watching practically every living thing there ever since - from spiders to hedgehogs. These days most of the larger mammals are radio-tagged, with hidden infra-red cameras, triggered by activity, hidden in dens and nests, ready to film everything. It all makes for very beautiful viewing, and very useful research data. Only purists, who like to think of wildlife cameramen as magicians, are likely to be disappointed at this expose of the techniques they use. A Bronx Tale (World, 9.30pm) is, if nothing else, a film that demonstrates the non-acting skills of two very good actors. Not that Robert De Niro and Chazz Palminteri as the rival role models who jointly teach a young boy how to be man, are not both on form here as performers. But they are also outstanding as the director and screenwriter of the film. This was actually De Niro's directorial debut. He may not have been very daring with the subject matter; New York crime stories are practically synonymous with his acting career. But this is also to his credit - at least he knows what he is doing with this kind of picture. He plays the straight-laced and popular local Mr Clean, who is trying to impress upon his son the importance of being a good guy, even while he knows the child is becoming more and more fascinated with the local Mr Big (Palminteri). Young Calogero is even more smitten with the glamour of the criminal life when he witnesses a murder, keeps his mouth shut about it, and gets taken on as a kind of gangster apprentice. It is not hard to work out where the film is going - the conflict between good and evil and Calogero's struggle to work out which side he really wants to be on is inevitable - but well-handled all the same. Martin Scorsese made De Niro a star, he also helped him become a pretty decent director.