GENESIS: The Flood was Punishment for Wickedness and Evil; "And all flesh died that moved on the earth: birds and cattle and beasts and every creeping thing that creeps on the earth, and every man!"

Then the Lord said to Noah, “Come into the ark, you and all your household, because I have seen that you are righteous before Me in this generation. (Genesis 7:1)

Of all the people on the earth at that time, only Noah found grace in the eyes of the Lord. Noah was a just man, perfect in his generations. Noah walked with God. (Genesis 6:8-9) Noah did; according to all that God commanded him, so he did. (Genesis 6:22) This is how we are righteous before God, in the midst of a wickedness and evil.  We are to walk with God, not after the ways of this world; and we are to obey His Word, whatever He tells us to do.  Noah represented what is required by God, and Christ Jesus fulfilled it when He came, “Who committed no sin, nor was deceit found in His mouth;” [Isaiah 53:9] (I Peter 2:22)

The scriptures don't say that Noah's children or the animals were righteous, just him; but because of him being righteous, his children and every species of animal will be saved also. "You shall take with you seven each of every clean animal, a male and his female; two each of animals that are unclean, a male and his female; also seven each of birds of the air, male and female, to keep the species alive on the face of all the earth. For after seven more days I will cause it to rain on the earth forty days and forty nights, and I will destroy from the face of the earth all living things that I have made.” And Noah did according to all that the Lord commanded him. Noah was six hundred years old when the flood waters were on the earth. (Genesis 7:2-6)

So Noah, with his sons, his wife, and his sons’ wives, went into the ark because of the waters of the flood. Of clean animals, of animals that are unclean, of birds, and of everything that creeps on the earth, two by two they went into the ark to Noah, male and female, as God had commanded Noah. And it came to pass after seven days that the waters of the flood were on the earth. In the six hundredth year of Noah’s life, in the second month, the seventeenth day of the month, on that day all the fountains of the great deep were broken up, and the windows of heaven were opened. And the rain was on the earth forty days and forty nights. (Genesis 7:7-12)

On the very same day Noah and Noah’s sons, Shem, Ham, and Japheth, and Noah’s wife and the three wives of his sons with them, entered the ark— they and every beast after its kind, all cattle after their kind, every creeping thing that creeps on the earth after its kind, and every bird after its kind, every bird of every sort. And they went into the ark to Noah, two by two, of all flesh in which is the breath of life. So those that entered, male and female of all flesh, went in as God had commanded him; and the Lord shut him in. (Genesis 7:13-16) "...two of every kind will come to you to keep them alive. And you shall take for yourself of all food that is eaten, and you shall gather it to yourself; and it shall be food for you and for them.” (Gensis 6:20-21)

Noah didn't go looking for the animals, but God sent the animals to Noah, two of every kind clean and unclean to keep alive, just like Noah and his wife. The additional seven each of every clean and unclean animal, a male and his female, God also sent to keep the species alive on the face of all the earth, just like He included Noah's three sons and their wife, male and female.  God is a loving God, but He is also a just God. “Therefore know that the Lord your God, He is God, the faithful God who keeps covenant and mercy for a thousand generations with those who love Him and keep His commandments; and He repays those who hate Him to their face, to destroy them. He will not be slack with him who hates Him; He will repay him to his face." (Deuteronomy 7:9-10)  And that's exactly what God did to the wicked and evil people on the earth, along with all living creatures who remained on the earth.

Now the flood was on the earth forty days. The waters increased and lifted up the ark, and it rose high above the earth. The waters prevailed and greatly increased on the earth, and the ark moved about on the surface of the waters. And the waters prevailed exceedingly on the earth, and all the high hills under the whole heaven were covered. The waters prevailed fifteen cubits upward, and the mountains were covered. And all flesh died that moved on the earth: birds and cattle and beasts and every creeping thing that creeps on the earth, and every man. All in whose nostrils was the breath of the spirit of life, all that was on the dry land, died. (Gensis 7:17-22) Even the animals of the water would be destroyed, when the floods would later subside. 

Christ Jesus warned that just as Noah prepared before the flood actually came, we are to prepare ourselves for His return also. “But of that day and hour no one knows, not even the angels of heaven, but My Father only. But as the days of Noah were, so also will the coming of the Son of Man be. For as in the days before the flood, they were eating and drinking, marrying and giving in marriage, until the day that Noah entered the ark, and did not know until the flood came and took them all away, so also will the coming of the Son of Man be." (Matthew 24:36-39; Luke 17:26-27) By faith Noah, being divinely warned of things not yet seen, moved with godly fear, prepared an ark for the saving of his household, by which he condemned the world and became heir of the righteousness which is according to faith. (Hebrews 11:7)

God gave all mankind on the earth at that time 120 years to repent, because that's how long it took Noah to build the ark. God, ...desires all men to be saved and to come to the knowledge of the truth. (I Timothy 2:3-4) ...the Divine longsuffering waited in the days of Noah, while the ark was being prepared, in which a few, that is, eight souls, were saved through water. (I Peter 3:20) But each of us will have to deal with the consequences of our own choices. For if God... did not spare the ancient world, but saved Noah, one of eight people, a preacher of righteousness, bringing in the flood on the world of the ungodly;... then the Lord knows how to deliver the godly out of temptations and to reserve the unjust under punishment for the day of judgment, and especially those who walk according to the flesh in the lust of uncleanness and despise authority. (II Peter 2:4-10)

So He destroyed all living things which were on the face of the ground: both man and cattle, creeping thing and bird of the air. They were destroyed from the earth. Only Noah and those who were with him in the ark remained alive. And the waters prevailed on the earth one hundred and fifty days. (Genesis 7:23-24)