The Star Wars databank article on Toydarians strongly implies that their resistance to mind-control comes from their mental strength of will. To the best of my knowledge, no mention is made within the main canon (e.g. film, TV shows, novelisations, etc) of them possession any biological defence against Jedi mind control techniques:

Toydarian are fly-like humanoids, with wings, a snout, and webbed feed. They are known to be strong-willed and resistant to manipulation through the Force.

This obviously ties in nicely with Anakin's statement in AotC about those that the mind-tricks work on:

PADMÉ: Are you going to use one of your Jedi mind tricks on me?

ANAKIN: They only work on the weak-minded....

The Star Wars databank article on Toydarians strongly implies that their resistance to mind-control comes from their mental strength of will. To the best of my knowledge, no mention is made within the main canon (e.g. film, TV shows, novelisations, etc.) of them possession any biological defence against Jedi mind control techniques:

Toydarian are fly-like humanoids, with wings, a snout, and webbed feed. They are known to be strong-willed and resistant to manipulation through the Force.

This obviously ties in nicely with Anakin's statement in AotC about those that the mind-tricks work on:

PADMÉ: Are you going to use one of your Jedi mind tricks on me?

ANAKIN: They only work on the weak-minded....

The Star Wars databank article on Toydarians states that their resistance comes from their mental strength. To the best of my knowledge, no mention is made within the main canon (e.g. film, TV shows, novelisations, etc) of any biological defence against mind control:

Toydarian are fly-like humanoids, with wings, a snout, and webbed feed. They are known to be strong-willed and resistant to manipulation through the Force.

This obviously ties in nicely with Anakin's statement in AotC about those that the mind-tricks work on:

PADMÉ: Are you going to use one of your Jedi mind tricks on me?

ANAKIN: They only work on the weak-minded....

The Star Wars databank article on Toydarians strongly implies that their resistance to mind-control comes from their mental strength of will. To the best of my knowledge, no mention is made within the main canon (e.g. film, TV shows, novelisations, etc) of them possession any biological defence against Jedi mind control techniques:

Toydarian are fly-like humanoids, with wings, a snout, and webbed feed. They are known to be strong-willed and resistant to manipulation through the Force.

This obviously ties in nicely with Anakin's statement in AotC about those that the mind-tricks work on:

PADMÉ: Are you going to use one of your Jedi mind tricks on me?

ANAKIN: They only work on the weak-minded....