“Speak to the birds.” This is an example of God telling His prophets to speak, that is, to prophesy, which is sometimes important in God bringing His Word to pass (see commentary on Hosea 6:5).
“of every kind.” The Hebrew text is literally, “of every wing,” meaning of all the different kinds of birds.
“Gather yourselves from all around.” The Hebrew is more literally, “from every side.” The birds and wild animals that were going to assemble and eat the flesh of all the people who died in the Tribulation and Armageddon were the “guests” who God called to His great sacrifice and feast (cp. Zeph. 1:7; Rev. 19:17-21).