they die or lose their mate
Yes
yes they do
yes. they migrate short distances
Yes
yes they have a brown body with dark spots for camouflage while nesting
Blackbirds reproduce by laying eggs.
Yes, they migrate short distances.
a group of Blackbirds is called a murder
Small fish, tadpoles/frogs, water striders and other insects, crayfish, snails, cottonmouths, water moccasins and other snakes, redwing blackbirds and other birds, butterflies, salamanders and newts, and various other species depending on the location of the riverbed.
There is no specific collective noun for blackbirds but any collective noun for birds will do; for example a flight of blackbirds or a flock of blackbirds.
Blackbirds