First plug the finch in and run dmesg to see what the system log made of it:
[merichar@dormouse ~]% dmesg | tail
[226206.828073] usb 5-1: new full speed USB device using uhci_hcd and address 11
[226207.008109] usb 5-1: New USB device found, idVendor=2354, idProduct=1111
[226207.008118] usb 5-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[226207.008125] usb 5-1: Product: Finch
[226207.008130] usb 5-1: Manufacturer: BirdBrain Tools
[226207.146317] generic-usb 0003:2354:1111.0001: hiddev0,hidraw0: USB HID v1.11 Device [BirdBrain Tools Finch] on usb-0000:00:1d.0-1/input0
[226207.146386] usbcore: registered new interface driver usbhid
[226207.146388] usbhid: USB HID core driver
[merichar@dormouse ~]% lsusb
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
...
Bus 003 Device 009: ID 0a5c:2110 Broadcom Corp. Bluetooth Controller
Bus 005 Device 013: ID 2354:1111