Well, no luck finding official 3E stats for a Swan, all that turned up after a brief investigation was the
Enworld conversion of the
Monster Manual II AD&D Swan.
That does lethal damage with its wings, but gets 2 wings that each do 1 point of damage.
Hmm, that suggests we could give it two wing-buffets that do 1d2+2 or 1d2+1 damage rather than a single wing-buffet, if we're being inspired by the swam.
We could also consider giving it a "bite/wing/wing" routine instead of the original "bite or wings". If a
swan can multi-attack, you'd think a Black Boobrie could as well.
We could have it so it can only Trip on a standard attack wing-buffet (+5 melee 1d2+2) but not on a bite/wing/wing routine's wing buffet (+0 melee 1d2+1, with the bite +5 melee 2d4+2)
I'm also becoming tempted to give both the boobries an augmented critical with their
beak bite, maybe ×3 like a spear? Or even 19-20×3.
Heck, my brainstorming's getting too complicated. Let's just go for:
Boobrie
Full Attack: Bite +10 melee (2d8+5/19-20×3) and 2 claws +5 (1d6+2)
Skills: racial bonuses to
Hide,
Intimidate and
Spot checks.
Black Boobrie
Speed: 10 ft. (2 squares), fly 60 ft. (average), swim 30 ft.
Full Attack: Bite +5 melee (2d4+2) or wing-buffet +5 melee (1d6+2) [
lethal]
Skills: racial bonuses to
Hide and
Spot checks.