Here are seven-letter English words that end with "late":

acylate, adulate, bullate, chelate, cholate, collate, dealate, deflate, emulate, fellate, gallate, inflate, isolate, ovulate, oxalate, prelate, prolate, reflate, replate, reslate, stylate, sublate, ululate, vallate, violate

Here are the seven-letter words that end with LATE, but I do not think any of them is a bird:

acylate, adulate, bullate, chelate, cholate, collate, dealate, deflate, emulate, epilate, fellate, gallate, inflate, isolate, ovulate, oxalate, prelate, prolate, reflate, replate, reslate, stylate, sublate, ululate, vallate, violate

According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 8 words with the pattern --SLA--. That is, seven letter words with 3rd letter S and 4th letter L and 5th letter A. In alphabetical order, they are:

beslave

enslave

guslars

mislaid

mislain

mislays

reslate

unslain

According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 3 words with the pattern R--LAT-. That is, seven letter words with 1st letter R and 4th letter L and 5th letter A and 6th letter T. In alphabetical order, they are:

reflate

replate

reslate

According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern R-SL--E. That is, seven letter words with 1st letter R and 3rd letter S and 4th letter L and 7th letter E. In alphabetical order, they are:

reslate