Do attacks from creatures summoned by the Conjure Animals spell count as magical?

Question

In our last session, the party was fighting a Ghost. A ghost has, among other characteristics, damage resistance to "Bludgeoning, Piercing, and Slashing from Nonmagical Attacks". The Druid had previously cast conjure animals to summon eight Owls.

When the Owl attacks the Ghost with its Talons, does that count as a "magical attack", and therefore bypass the Ghost's damage resistance?

The standard reference that I've found for figuring out if an attack is magical is in the Sage Advice Compendium, which has this to say under "Is the breath weapon of a dragon magical?":

Determining whether a game feature is magical is straightforward. Ask yourself these questions about the feature:

• Is it a magic item?
• Is it a spell? Or does it let you create the effects of a spell that’s mentioned in its description?
• Is it a spell attack?
• Is it fueled by the use of spell slots?
• Does its description say it’s magical?

If your answer to any of those questions is yes, the feature is magical.

I'm not sure, though, if this qualifies as "is it a spell" or "is it a spell attack", as it isn't quite either... But being a summoned fey creature in the form of a beast sure seems like a magical sort of thing more so than, say, a dragon's breath weapon would be.

Answer 1

No

Owls (summoned or not) attacking anything do not give a "yes" answer to any of the above questions.

• Is it a magic item? No, it's a fey in the shape of an owl
• Is it a spell? Or does it let you create the effects of a spell that’s mentioned in its description? No, it's a fey in the shape on an owl
• Is it a spell attack? No, it's a fey in the shape on an owl
• Is it fueled by the use of spell slots? No, it's a fey in the shape on an owl
• Does its description say it’s magical? No, it's a fey in the shape on an owl

The summoning is the magic, not what the summon does later. Otherwise, characters could summon rats, tie one of them to a stick, and declare it a +1 rat flail.

Beyond that fey as a general rule are not magical in the sense of attacks. Looking at the basic fey creatures in the Monster Manual (Hag, Blink Dog, Satyr, etc) all of their base attacks do not mention being magical in nature.

In contrast, if you look at say the planetar, it specifically says "the planetar's weapon attacks are magical."

Answer 2

RAW:

As established in the Sage Advice Compendium:

Determining whether a game feature is magical is straightforward. Ask yourself these questions about the feature:

• Is it a magic item?
• Is it a spell? Or does it let you create the effects of a spell that’s mentioned in its description?
• Is it a spell attack?
• Is it fueled by the use of spell slots?
• Does its description say it’s magical?

If your answer to any of those questions is yes, the feature is magical.

And in the Monster Manual Errata: "[...](a magical attack is an attack delivered by a spell, a magic item, or another magical source)."

1. If you consider "fey spirits" as magical (once they don't have a definition by the official books): I would consider it as magical attacks, because the attacks come from a FEY SPIRIT (not a normal fey creature) and therefore they are magical sources and every interection of them with the enviroment is by magical ways.
2. If you don't consider fey spirits as magical: Then the attacks are not magical since they don't came from a magical source.

RAI (and the way I would judge):

It is not a magical attack, simply because in the circle of the shepherd (as shown by another user in a comment above) says that "Starting at 6th level, beasts and fey that you conjure are more resilient than normal. [...] The damage from its natural weapons is considered magical for the purpose of overcoming immunity and resistance to nonmagical attacks and damage." and would make no sense to make that statement if they already were considered magical attacks.