From “Australia’s truly glamorous camper”, NewScientist 3/5/11, p. 22:
Call it classy camping gear. Baby Australian leafhoppers (Kahaono montana) pitch silk tents to keep them safe from predators.
The point of interest is the non-reflexive object them, anaphoric to the subject baby Australian leafhoppers — in a configuration where a reflexive pronoun (themselves) would normally be expected.
Reflexive pronouns are mandatory when the pronoun is the direct object of a verb that has a coreferential NP as its subject, as in
Tim blamed himself. Tim considered himself a victim. Tim committed himself to fighting. Tim asked himself to be heroic.
(In all of these, him rather than himself would refer to someone other than Tim.) This restriction extends to a wide range of two-verb constructions in which the pronoun is the direct object of the second verb (while being coreferential to the subject of the first):
Tim tried to defend himself. Tim kept contradicting himself. Tim promised his friends to defend himself. Tim went to the session to understand himself better.
Then things get complicated. In particular, there’s a well-known collection of cases where reflexives are optional (some CGEL discussion on p. 1489):
Tim always kept a gun near him/himself. Tim directed the overflow away from him/himself.
These have governing prepositions indicating spatial location, but there are also some two-verb examples, with certain specific verbs, as in the NewScientist example, with keep, and in:
Tim used the tarpaulin to make him/himself safe from the rain. Tim had some medicine to help/get him/himself out of pain.
There’s considerable individual variation for both types of optional reflexives.
For further entertainment, note that there are cases of impermissible reflexives in two-verb constructions:
Tim prevented/kept the rain from hitting him/*himself.
So all three possibilities are attested within clauses: obligatory, optional, and impermissible reflexives. (Between-clause reflexivization is another matter. Generally, reflexives are impermissible between clauses — Tim said that Mary had seen him/*himself — but there are complex patterns of exceptions.)
I never promised you that syntax would be easy.