Cowardly
Yellow
Usually, to begin a long distance call from your home phone, it's the first number you must press
1
In a German-speaking region, it's a motor expressway
Autobahn
Buffalo & other bovines gather in these
herds
It's the word usually seen on the sign here

yield
Sad or depressed
Blue
In popular phrases it follows "gimme" & "take"
Five
Taken from the name of Plato's institution, it's a school for special instruction
Academy
Just as you can have a this "of roses", you can also have one of oysters
a bed
It was a popular abbreviation for the year 2000
Y2K
New, inexperienced or envious
Green
Years of bad luck associated with breaking a mirror
7
It borders Slovenia, Hungary & Switzerland
Austria
A stench, sometimes used for a group of these mammals, may be appropriate but seems a bit unfair
skunks
George Bernard Shaw supposedly said, this "is a wonderful thing. What a crime to waste it on children"
youth
Fry or saute
Brown
Total number of royal flushes that can be dealt out of one deck of cards
4
The first Jewish high priest
Aaron
It's a cloud of grasshoppers & a plague of these relatives
locusts
This website's stated purpose is "to connect people with great local businesses"
Yelp
Abandon on a desert island
Maroon
The difference between a million & a billion in the U.S. is just this many zeros
3
Yes, captain, it's the small Madagascan primate seen here:

Aye-aye
Termites & penguins both get collective with this collective name
colony
Add 1 letter to a device used to pair draft animals to get this term for a country bumpkin
a yokel