Beheaded Tulips

Beheaded Tulips

So, I have a real mystery on my hands that I'm hoping someone here might have insight into. I put in 3 dozen tulips in the fall and they've all come up very nicely--the leaves, the stems, the buds all look great. The problem is that as soon as the bud starts to color, the tulip loses its head. Not one of them has been able to open! There are about eight left with buds right now, all green, but if the unfailing trend of the past few weeks is any indication, they too will soon be headless. I find the bud on the ground, sometimes fully intact, sometimes not. The break from the stem seems pretty clean, no knawing or anything, but not as clean as if it were cut with scissors either. There doesn't seem to be any insect damage. It could be the army of squirrels who pester me and all my growing things, but it seems unlikely as I've never seen them around the tulips and usually their m.o. is to dig stuff up, not chew it down. The tulips are in the backyard against a small wall so they have some protection from the wind. It has been sort of windy and cool here (just outside of Boston) but nothing really unseasonable. None of the other flowers in the yard are being beheaded, it's just the tulips. Other people in nearby houses seem to have tulips coming up just fine... so...any ideas? I looked around the internet for tulip info., but I can't find anything that seems relevant. Any thoughts as to the mystery of the tulip decapitations would be appreciated!
So this is my room

So this is my room

ikea, red & white

ikea, red & white

more garden pictures

more garden pictures

Monday July 21st, first fruits for Valley of Heart’s Delight

Monday July 21st, first fruits for Valley of Heart’s Delight

Plant ID please

Plant ID please

Happy Shamrock Day

Happy Shamrock Day