It's funny. Everything is funny. He has a body and he can take actions with it.

Giggling is a funny noise and she starts chirping in the same pattern.

...Okay that's actually hilarious. Now he is laughing even more.

Why is the flesh person making such weird noises. This is vaguely concerning.

Bird lady, I regret to inform you that that is like objectively the least concerning thing about this particular flesh person.

He calms down after a few minutes, anyway, although he's still kinda bouncy.

She tries poking him again.

He giggles, and pokes back.

Squawk!

Her feathers ruffle a bit. She then starts turning her head side to side to better eye him. He's weird and shiny and probably not food so she doesn't quite know what to make of him. (Flesh things are usually food but metal is not and she has no real priors about not-food that started looking like food.)

Poking her again seems like a fun game!

She tries to peck his finger. She's fast and her beak is sharp, but it's an awkward angle for her.

He's quick enough to avoid being pecked, at least this time.

She pulls back a bit, and her third eyelid slides over her eyes briefly before retreating, making them milky.

A sort of melodious sound halfway between a croak and a scream escapes her throat. She's curious and determined and really wants to know if he's food, but she's not quite ready to peck him again. She starts circling a bit.

He watches her, smiling.

She makes that half-scream noise again and tries to peck him.

He laughs and dodges again. This time he is not so fast.

!

She keeps trying. She doesn't seem ruffled, though, and might even be amused.

Dodging while she tries to peck him: a new fun game!

She gets bolder, and therefore faster, when he doesn't retaliate.

This time her beak scores a line across the back of his hand.

"—!"

He pulls back, startled. This is a NEW EXPERIENCE. For a second he's too surprised and overwhelmed by this novel and alarming sensation to even begin to decide how he feels about it.

He tastes like metal instead of flesh. His body is a DECEPTION.

She squawks, highly offended.

He blinks, then giggles again.

Offended ruffling of feathers and almost frantic preening to get that taste out of her mouth.

"Well don't do that then!" he says, logically.

Unfortunately she doesn't know words, and he persists in using those weird mammal noises instead of chirps, squawks, and trills like a reasonable bird.

That's okay, he doesn't really mind that she can't understand him.