want to hang off of gutters do they require nails to attach the lanyard?

These require something for them to loop around and hang from. It doesn't necessarily have to be nails, it can be where 2 pieces of metal come together, but just something to hang them from. Each reflector rod has a thin elastic loop attached at one end so you can hang it. There is also a hole on the other end of the rod, so there are holes on each end of the rod so that if you want, you can attach multiple rods to each other. You don't have to use the elastic loop that comes attached to the rod to hang it. You can use a zip lock tie, which is what I've done, depending on where you are hanging it.I've hung some from very thin branches of a bush, where I used zip lock ties to make sure they were firmly attached to the super thin branch and wouldn't fly off in windy weather. Hope this info helps.

would the multicolor scare hawks away?

In my opinion, from my experience, I don't think they scare anything away. I used the silver, shiny ones and the birds still ate about 1/3 of my peaches, or more. Don't why hawks would be different, but the hawks around where I live stick to the rabbits and the occasional cat.

Brand	Hausse
Colour	Silver
Style	Repellent
Material	Plastic
Product Dimensions	25L x 25W x 292H Millimeters
Item Weight	318 g
Number of Pieces	30
Recommended Uses For Product	Indoor, Outdoor
Is Electric	No
Target Species	Bird
Net Quantity	30.0 count
Manufacturer	TAIZHOU JIYUAN PLASTIC CO., LTD.
ASIN	B092RWYGFG

Hausse 30 Pack Bird Deterrents for Outside, Bird Repellent Hanging Silver Plastic Reflectors Scare Rods, Garden Decorative Reflective Scare Birds Away, Like Woodpeckers, Pigeons and Geese

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