Hover (3.5e Creature Ability)

Hover
flight, except that the hovering creature can not fly higher than its natural reach.]]

A hovering creature cannot clear objects taller than its reach. A hovering creature is unimpeded by any form of terrain so long as it is sufficiently level to not possess outcrops taller than its reach. Creatures that hover do so with a certain level of maneuverability (see Fly), but they can always hover in place regardless of maneuverability.

A creature with a natural reach below 5 feet is treated to have a reach of 5 feet for the purpose of hovering.

A creature which has both hover and flight can choose to hover at any altitude it can sustain, regardless of maneuverability.